List Of Curtas


Click on the Curta Icon in the upper left corner to go to this site's Contents/Collaboration page.

How old is your Curta relative to the others on the list? Do you have a serial number incrementally next to someone else on the list? Is your Curta the oldest known of either a Type I or a Type II? Is your Curta the newest known of either Type? Is your Curta's serial number a prime number? Is it one of a twin prime (the next prime number differs by only 2 counts)? Is the next one on the list the twin prime to yours? See http://www.utm.edu/research/primes/lists/small/


Below is an ordered listing of Curtas and their owners. The Curtas are listed in ascending numerical order using their serial numbers as the index.

You can add your name and your Curta's serial number to the list by clicking here --> [1] <-- or click the "Edit Text" link at the bottom of this page. You'll have to locate the position within the text where you want to place your entry, so just scroll down as needed in the editing window. Place your cursor after the name of the owner for the Curta that precedes your serial number, type a carriage return, insert a single blank space as a first character of the new line (immediately before your Curta's serial number), and finally type your Curta's serial number, your name, and where you live (if you wish). Insert dashes and spaces as in the other listings. Important...You must insert a single blank space as the first character of the new line. This puts your entry on a new line in the updated Curta list page, and aligns your information properly with that above and below. Also, if you normally use upper case letters somewhere in the middle of your name, please add a space before the "mid-word" upper case letters. Doing so will prevent a new Wiki page from automatically being formed. (See AddingNewPages for details.)

Due to improper use of this page for private purposes, you are now required to register with Curta.org if you wish to add your name and machine serial number to the owner's list. When you select the "Edit Text" link, you'll be asked to login or register. Follow the directions given to you and you'll be allowed to modify this and other Curta.org pages.

Or, if you prefer not to register, you can send your name, location, and the serial number of your Curta to mailto:curta.info@gmail.com using a subject something like "Add my name". The administrators of the Curta.org site will then update this list with your information.


All Type I's are listed first, as their serial numbers started at 1 (assumed, but not confirmed) and continued up to approximately 80500. Type II serial numbers started at 500001 (also assumed and very likely the case, as serial number 500025 is in someone's possession) and continued up to approximately 570000.

Factory documentation indicates that the last Type I produced by Contina was serial number 79524. Contina documentation also states that the last Type II produced was serial number 561660. When the factory doors closed, some workers were given enough parts to build complete machines. These Type I and Type II Curtas were assigned serial numbers higher than the highest factory documented units. These machines are true Curtas in every sense...they simply were built outside the factory facilities by the same people who assembled them within the factory.

To discover whether your Curta's serial number happens to be a prime number, go to: http://www.utm.edu/research/primes/lists/small/ or http://www.prime-numbers.org/

By the way, if you have a Curta Type I with serial number 8128, you may have the only Curta manufactured with a "perfect number" as its serial number. (This assumes that Type I's with serial numbers 6, 28, and 496 (the only perfect numbers less than 8128) were never made. The next perfect number greater than 8128 is 33550336, and no Curta was made with such a high serial number.) For information on Perfect Numbers go to: http://primes.utm.edu/glossary/page.php?sort=PerfectNumber


TYPE I

 970  -- Johannes Schranz
 978  -- Burkhard Pock (Austria)
 2044 -- Donald Rosen (USA)
 2049 -- Donald Rosen (USA)
 2096 -- Paul Fiel
 2185 -- RickFurr (USA)
 2880 -- Donald Rosen (USA)
 3047 -- JackChristensen (USA)
 3065 -- Geoffrey Cross
 3067 -- Claude Van Houtte
 3103 -- Des Harrison (New Zealand ex SA)
 3234 -- Daniel Lewin
 3275 -- Donald Rosen (USA)
 3404 -- Hermann Hierhager (Germany)
 3488 -- Peter Geldof
 3605 -- Steve Saslow (USA)
 3681 -- Pepper S. Younts (USA)
 3748 -- Robert Rosenwald 
 3823 -- David Richardson (USA) -- TwinPrimeCurta; the higher of its twin prime 3821
 3919 -- Santiago de Churruca Egoscozabal -- TwinPrimeCurta; the higher of its twin prime 3917
 3928 -- Rosa Schlaepfer Pereira
 4379 -- Frans Goedhart (fransamsterdam the netherlands)
 4414 -- John Race
 4421 -- JackChristensen (USA)
 4474 -- John Bell
 4529 -- Erez Kaplan
 4703 -- James Black -- PrimeNumberCurta
 4730 -- Mitch Wofchuck
 4744 -- Donald Rosen (USA)
 4811 -- Donald Rosen (USA)
 4937 -- JackChristensen (USA)
 4965 -- JackChristensen (USA)
 5098 -- Ignacio Barbosa Moreira
 5099 -- Peter Bird -- TwinPrimeCurta; the lower of its twin prime 5101
 5187 -- Mike Griessel
 5227 -- Lita Hayes -- PrimeNumberCurta
 5856 -- Alastair Redpath-Stevens
 6083 -- Israel da Silva (Brazil)
 6656 -- R. N. Labas (Chile)
 6735 -- Jim Walpole (UK)
 6845 -- Dr David Key
 7057 -- Daniel Lewin -- PrimeNumberCurta
 7087 -- Joel Texier
 7269 -- Ian Battey
 7450 -- Waldbauer Helmut
 7633 -- E. Sprague (USA)
 7624 -- Donald Rosen (USA)
 7729 -- DOouglas Mahone (USA)
 7753 -- Hermann Hierhager (Germany) -- PrimeNumberCurta
 7854 -- David Southall
 7903 -- Bernard Cadier
 8245 -- H.J.MEAD
 8248 -- Maurice Robinson
 8321--  Nicholas Cassin
 8354 -- John Birch
 8399 -- John Bentley
 8428 -- David Owensby
 8651 -- ???? -- In Demonstration Kit unit sold on eBay in January 2003
 8726 -- Dr. Srinivas K. Reddy
 8883 -- Ralph Hesson
 9068 -- Nita de Glanville
 9092 -- Glen Davidge
 9242 -- Martin Wood 
 9296 -- James Black
 9570 -- Erik Novikoff
 9724 -- Peter Hobbs (UK)
 9916 -- Mark G. Leonard
 10133 -- Mario Nagano -- PrimeNumberCurta
 10148 -- Paulo Boselli
 10212 -- Donald Rosen (USA)
 10265 -- Frank De Witt
 10289 -- Clifford A Johnson (USA) PrimeNumberCurta
 10300 -- David Bannister
 10370 -- David Richardson (USA)
 10414 -- Fernando Aveledo (Venezuela)
 10577 -- Prof. Karl Kleine
 10582 -- George O'Farrell
 10643 -- Donald Rosen (USA)
 10759 -- Colin Labouchere
 11039 -- Gernot Hilger (Bonn, Deutschland) (S/N=7x19x83)
 11155 -- Robert Adam
 11220 -- Lars Lund-Hansen
 11259 -- John Wells (South Africa)
 11348 -- Eddie Letzer
 11536 -- Marc Hoffeld
 12023 -- Francisco A. Amaral
 12203 -- Pepper S. Younts (USA) -- PrimeNumberCurta
 12270 -- Juan Luis Munoz de Laborde 
 12365 -- Robert Shaffer
 12793 -- Laurence Bixby
 12841 -- John Lafler -- PrimeNumberCurta
 12873 -- David Lukasik
 12936 -- Charles Brown
 12969 -- Dr Patrick Covernton
 13017 -- Rob Lewis
 13056 -- Adam
 13136 -- Birthe Dissing
 13316 -- Leo F Braun
 13426 -- Dan Kennison
 13545 -- Matthias M Weber
 14392 -- Brian Lewis
 14568 -- Habib Karacan
 14611 -- Ed Zinszer
 14902 -- James Black
 14949 -- Dan Hamilton
 14961 -- Denise Banks
 15045 -- Rick Furr (USA)
 15053 -- Paul Ricci -- PrimeNumberCurta
 15529 -- Pepper S. Younts (USA)
 15881 -- Rich Beck -- PrimeNumberCurta
 15941 -- David Harper (USA)
 16812 -- Richard Rafter
 16829 -- Dave Slater -- PrimeNumberCurta
 16855 -- Jeff Wilson
 16956 -- Dr. Stan Fry, Jr. 
 16985 -- David Owensby
 17075 -- JackChristensen (USA)
 17626 -- Stanley Siege
 17881 -- Daniel Davis (USA) -- PrimeNumberCurta
 17903 -- Jim Bridges -- PrimeNumberCurta
 17942 -- Peter Schneider (USA)
 18027 -- Bob Grow
 18204 -- Robert Delgado (USA)
 18754 -- Gerry Kennedy (UK)
 18832 -- Linda Blythe
 18866 -- James Black
 18944 -- Lars Lund-Hansen
 19038 -- Orthopedic Surgeon 
 19049 -- Dov Gadot
 19327 -- Craig Reynolds
 19500 -- Norm Guttormson
 19716 -- Peter Misic
 19739 -- Peter Hobbs (UK)
 19834 -- Joel O'Rourke
 19847 -- Ian Gent
 19881 -- Daniel V Klein
 20021 -- Darrel R. Dilley -- TwinPrimeCurta; the lower of its twin prime 20023
 20022 -- Bobby L. Jones
 20071 -- Bill Taylor A.S.C. -- PrimeNumberCurta
 20089 -- Gary Marsden -- PrimeNumberCurta
 20175 -- Vincent Merlen (Canada)
 20247 -- Jay Holovacs
 20255 -- Takashi Tanemura (Japan)
 20350 -- Valery Tsimmerman, P.E. 
 20526 -- Harold Mernick
 20759 -- Kurt Rochlitz -- PrimeNumberCurta
 21302 -- Don Spann (USA)
 21319 -- Jim May -- PrimeNumberCurta
 21352 -- Dean P Mc Cullough
 21452 -- Craig Hammes
 21994 -- Mike Williams
 22102 -- Luc Degols
 22908 -- Herb Gold
 23575 -- Mark Westaway
 24019 -- Carlos L. Gaston -- PrimeNumberCurta
 24149 -- Peter W. Allen
 24218 -- Don Hediger
 24838 -- Andres Romero Ortiz 
 24855 -- Martin Feichtinger
 25356 -- Bruno Perrone Delgado (Ecuador)
 25668 -- Edmundo Duran
 25801 -- Donald Rosen (USA) "Twin Prime Curta"; the higher of its twin prime 25799
 25832 -- Otto Frex Mayer
 25915 -- Art Rosen
 25945 -- Donald Rosen (USA) Cut Model
 26449 -- Gilles Bajolet -- PrimeNumberCurta
 27545 -- Dave Aitchison (Australia)
 27970 -- Sandra Ausher
 28037 -- Whisperine
 28269 -- John Bellefleur (Canada)
 28290 -- Dave Estall
 28332 -- Gus Teljer
 28382 -- Caesar Guevara 
 28732 -- Richard Williams
 29063 -- Paul Powell -- PrimeNumberCurta
 29093 -- Patrick Finnigan
 29274 -- John Steigerwald
 29505 -- Rob Waight
 29636 -- Michael C. Gibbons
 29749 -- Peter Hobbs (UK)
 29759 -- Martin Sidley -- PrimeNumberCurta
 29799 -- Corey R. Vest
 29810 -- Waldbauer Helmut
 30422 -- Louis Skelton, Curator
 30903 -- Gerry Hughes
 31110 -- John Targell
 31486 -- Juerg Dedual
 31649 -- Peter Hobbs (UK) -- PrimeNumberCurta
 31654 -- Klara Reisch
 31797 -- Mery Christophe
 32597 -- Bill Taylor A.S.C.
 32882 -- William R. Clements
 32937 -- Denis Miller (Australia)
 33138 -- John Bellefleur (Canada)
 33140 -- John Bellefleur (Canada)
 33142 -- Alex (Sandy) Mackay
 33199 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 33212 -- Nicholas Bodley
 33940 -- Marcelo Amarante
 34097 -- Stefan Nordqvist
 34224 -- Ben Edgington
 34387 -- Hans-Joachim Hoeft
 34400 -- Sandy Houck
 34712 -- Bill Bowers
 34726 -- Cleo E. Mc Call
 34811 -- Steve A
 34969 -- Darrin B	(USA)
 35058 -- Phil Symons
 35243 -- David Senkfor(USA)
 35276 -- John De Koning
 35410 -- Fredrik Breivald
 35923 -- Olle Nilsson -- PrimeNumberCurta
 35969 -- Peter Hobbs (UK) -- PrimeNumberCurta
 36252 -- Frank G. Soler
 36440 -- Erwin Tomash
 36642 -- Hans-Joachim Hoeft
 37262 -- Christian Miller (Austria) -- Demo Curta in green presentation box
 37279 -- Harold Meltzer
 37583 -- John Bellefleur (Canada)
 37683 -- Pierre Zimmerman
 37947 -- Ulrich Clormann
 38203 -- Harold Meltzer
 38230 -- Mohammed Zahir .M. Chawdhry
 38282 -- Roger R. Hineman
 38335 -- Simon Cassford
 38368 -- Erez Kaplan
 38599 -- Mark Butterworth
 38603 -- John S. James -- PrimeNumberCurta
 38766 -- Martin Feichtinger
 39133 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 39172 -- Skip Downey (USA)
 39353 -- Chris Warman (USA)
 39643 -- Craig Seeley
 39824 -- Peter Hobbs (UK)
 40030 -- Michael Meissner (Germany)
 40198 -- Jan Brown
 40437 -- Ray Feldman
 40557 -- Ray Woods
 40674 -- Bruno Wroblewski
 41115 -- Miki Mihajlovic
 41784 -- Bruce C. Boatwright (Madison, SD)
 41837 -- Peter Hobbs (UK)
 41989 -- Dr. Srinivas K. Reddy
 42177 -- Paul Van Hoof
 42769 -- Heidi Abrams
 42770 -- Arthur S. Graham (USA)
 42999 -- Dana G. Tremblay
 43080 -- Steve White
 43241 -- Gary Steinbaugh
 43298 -- Ann R. Craven
 43323 -- Larry D. Allgood
 43437 -- Donald A. Sharp 
 43547 -- Lavillat Christian
 44150 -- Rick Stanard
 44193 -- David Bonnes
 44233 -- Christoffer Holmberg
 44385 -- Don Murtagh
 44423 -- Max Matthews
 44605 -- Thomas Shaffer
 44642 -- George Bingley
 45160 -- R. N. Labas - (Chile)
 45167 -- Richard Weixler
 45632 -- Neil Bartlett
 45740 -- Pepper S. Younts
 46011 -- Peter Hobbs (UK)
 46560 -- Kleber Loureiro (Brazil)
 48243 -- John J Pisarcik
 48663 -- Brian Randell (UK)
 48680 -- Pablo Flores Maini
 48722 -- Waldbauer Helmut
 48723 -- Fredrick Karubian
 48762 -- Waldbauer Helmut
 48808 -- Artur Kultys (Poland)
 48838 -- Mal Thurman
 48842 -- Don Townsend
 49400 -- Tunny Pattison
 49414 -- Dale Boyd
 49444 -- Brian Lewis
 49465 -- Larry Mc Elhiney
 49603 -- Darin May -- PrimeNumberCurta
 50248 -- Oktay Haracci 
 50383 -- Mark W. Rodgers -- PrimeNumberCurta
 50448 -- Harold Goldberg 
 50492 -- Mario Garza
 50515 -- William Wasmer
 50571 -- Doug Glover
 51196 -- Bengt-Eric Grandin
 51266 -- Ken Sanford (USA)
 51295 -- Frank Gagliano
 51832 -- Peter Hobbs (UK)
 51842 -- David Andersen
 51909 -- Douglas A. Cawley
 52043 -- Jim Bianchi
 52116 -- Charles Jensen
 52313 -- Peter Schneider (USA)
 52458 -- Lawrence Keeney
 52546 -- Elizabeth Greenberg
 53124 -- Klaus Hanfler
 53177 -- Waldbauer Helmut
 53256 -- The Boyds
 53267 -- Jamie Cox -- TwinPrimeCurta; the lower of its twin prime
 53323 -- Richard Weixler -- PrimeNumberCurta
 53429 -- Ulrich Clormann
 53611 -- Donald Rosen (USA) -- TwinPrimeCurta; the higher of its twin prime 53609
 54647 -- Doug Woods -- PrimeNumberCurta
 55358 -- Peter Hobbs (UK)
 55500 -- Pepper S. Younts (USA)
 55628 -- Jim Spofford - http://www.jimspofford.com
 55800 -- Marcel van der Sluis
 55845 -- Glenn Bell
 55875 -- Fung Mun Tong Louis (Hong Kong)
 55937 -- Donald Rosen (USA) -- Demonstrator
 56190 -- MD Meason 
 56245 -- Joseph J Hansen
 56250 -- RT Young
 56295 -- Michele Sandra Murphy
 56434 -- Matz Cohen
 56691 -- Nathan Zeldes
 56711 -- Donald Rosen (USA) -- TwinPrimeCurta; the lower of its twin prime 56713
 57202 -- JackChristensen (USA)
 57376 -- Waldbauer Helmut
 57555 -- Steve Saslow (USA)
 57592 -- Peter Hobbs (UK)
 57607 -- Brian Cohen
 57897 -- Andy McNish? (Canada)
 58134 -- Ken Seydel
 58294 -- Grant Youngman
 58298 -- John Bellefleur (Canada)
 58562 -- Rick Furr (USA)
 58582 -- David Richardson (USA)
 59073 -- Giovanni Breda
 59112 -- Udo Stichling
 59132 -- Aimeric 
 59349 -- Glenn Jolliffe
 60003 -- Mark Warren
 60052 -- Wim Schouten
 60413 -- Pepper S. Younts (USA) -- PrimeNumberCurta
 60510 -- Walter J. Gray
 60609 -- David Senkfor (USA)
 60674 -- Roger D. Brown
 60870 -- Mark Handler
 61438 -- Graham D Harris
 61990 -- Giovanni Breda
 62076 -- R. Bruce Gezon
 62305 -- Donald Rosen (USA)
 62569 -- Bob Mason
 62675 -- Gray Poole
 63252 -- Fred Jacobs
 63341 -- Peter Hobbs (UK)
 63708 -- Julian Burke
 64065 -- K. J. Curtis
 64112 -- Chris Woodward
 64224 -- Lindley and Charlotte Mixon
 64360 -- Charles Smith
 64448 -- Tony Bennett (UK)
 64555 -- E. H. Rettig
 64779 -- Werner Schaefer
 65250 -- Stephen Rowe
 65448 -- Gerwin R. Bertelmann
 65929 -- Thomas Mc Namara (USA) -- TwinPrimeCurta; the higher of its twin prime 65927 
 65963 -- Michael Jason Edwards -- PrimeNumberCurta
 66132 -- Bill Leonard
 66666 -- Michael Barger
 66683 -- Laszlo Boydan
 66831 -- Thom Boughton
 66870 -- Dave Bunsey, Sr.
 67290 -- Richie Tomasich
 67399 -- George E. Heath -- PrimeNumberCurta
 67406 -- JackChristensen (USA)
 67544 -- Jim Carlson
 67557 -- Alex Friedman
 67619 -- Rich Scholl -- PrimeNumberCurta
 67741 -- Mark Jason Dominus -- PrimeNumberCurta
 67995 -- Dib Karam Junior
 67997 -- Ludgerus Friedhoff
 68696 -- Javier Susaeta-Erburu
 68909 -- David Weil -- PrimeNumberCurta
 69125 -- David Bannister
 69601 -- Eric Furman
 69639 -- Ben Hogue
 69979 -- Larry Vanice
 70071 -- Douglas Brown
 70224 -- Peter Guerrini
 70393 -- Donald Rosen (USA)
 70511 -- James Godwin
 70669 -- Bill Leonard
 70883 -- Andrew Davie
 71070 -- Rupert Quayle
 71125 -- David Kristopeit
 71132 -- Donald Rosen (USA)
 71198 -- Hap Murphy
 71239 -- JackChristensen (USA)
 71275 -- William Mc Bride
 71424 -- Bill Stanard
 71335 -- Stephen M. Evans
 71739 -- Tom Callan
 71766 -- Vincent Merlen (Canada)
 72353 -- Chris Andreae -- PrimeNumberCurta
 72367 -- JackChristensen (USA)
 72412 -- Darrell Haulsee
 72523 -- Robert Irwin
 72538 -- Nigel Thompson
 72857 -- Clay Castleberry
 73060 -- Bill Thacker
 73064 -- Ian Drown
 73410 -- Andrew Forsberg
 73545 -- Allan Simon
 73591 -- Herb Gold
 73736 -- Rick Miskell 
 73961 -- Scott Soper -- PrimeNumberCurta
 74021 -- Walt Kammer (USA) -- PrimeNumberCurta
 74116 -- Jim Hawkins 
 74678 -- Mark Reinhardt 
 75083 -- Gerhard Wenzel -- PrimeNumberCurta
 75262 -- Dave Daley 
 75395 -- Adams Douglas
 75422 -- Peter Hobbs (UK)
 75460 -- Donald Rosen (USA) 
 75549 -- Tom Poole 
 75586 -- Arden Howell IV 
 75789 -- Diane 
 75896 -- Roland Soucie 
 75931 -- Richard L. De Saussure, III -- PrimeNumberCurta
 76153 -- Michel Poirier-Defoy 
 76258 -- Vaclav Michal Stepanek 
 76640 -- Gary D. Snyder
 76695 -- James Bradshaw (UK) 
 76994 -- Gary Fleischer 
 77052 -- Harold Mernick
 77061 -- COL Jim Van Dam (Ret)
 77142 -- Skip Godfrey (USA)
 77514 -- Joel O'Rourke 
 77619 -- MSG Larry Turley 
 77621 -- David Senkfor (USA) -- PrimeNumberCurta
 77648 -- David Rackowitz	
 77678 -- Terry Petty
 77735 -- Christopher Paraskevas
 77798 -- Burt Newmark 
 77823 -- Graham Hill 
 77908 -- Bill Potvin
 77937 -- Donald Rosen (USA)
 78057 -- John Favill 
 78096 -- Tommy Estridge 
 78642 -- Dianne Wood 
 78845 -- J. Dekker
 79020 -- John Marvin 
 79123 -- Bernhard Adams 
 79130 -- JackChristensen (USA)
 79256 -- Mac Thompson
 79294 -- Pepper S. Younts (USA) 
 79572 -- Martin Feichtinger
 79721 -- Peter Hobbs (UK)
 79813 -- Hoch Florian -- PrimeNumberCurta
 79933 -- Donald Rosen (USA)
 80288 -- Thomas Stocker
 80332 -- Hermann Hierhager (Germany) 


TYPE II

 500025 -- Jim Walpole (UK)
 500067 -- Brian J. Kemp
 500084 -- Fred Sweeting 
 500088 -- HansRudolfRoshard (Switzerland)
 500125 -- Hermann Hierhager (Germany)
 500159 -- Ian Mcintyre (New Zealand)
 500204 -- Donald Rosen (USA)
 500315 -- Steve Saslow (USA)
 500415 -- JackChristensen (USA)
 500485 -- Tony Offerman
 500494 -- JackChristensen (USA)
 500639 -- Paul Smith 
 500671 -- David Richardson (USA)
 500747 -- Manuel Dierbach (Germany)
 500845 -- Martin Feichtinger 
 500963 -- Donald Rosen (USA)
 501065 -- Donald Rosen (USA)
 501067 -- Steven Swift (USA)
 501072 -- Donald Rosen (USA)
 501203 -- Donald Rosen (USA)
 501324 -- Bernard Stedman 
 501325 -- Damon O'Donoghue 
 501374 -- JackChristensen (USA)
 501449 -- DennyHardy (Europe)
 501523 -- Roger Kirkham 
 501656 -- Dwayne Newton 
 501787 -- Victor Kuhl
 501905 -- Mike Williams 
 502072 -- Donald Rosen (USA)
 502211 -- Peter Hobbs (UK)
 502620 -- Richard Freedland 
 502693 -- Harold Mernick
 502809 -- David Nessl 
 503322 -- Waldbauer Helmut 
 503359 -- Glen Davidge -- PrimeNumberCurta
 503486 -- John Rix
 503491 -- Pepper S. Younts (USA)
 503867 -- Alan Hoare 
 504220 -- Hans-Joachim Hoeft 
 504538 -- Donald Rosen (USA)
 504708 -- David Richardson (USA)
 504889 -- Donald Rosen (USA)
 504988 -- John Favill 
 505168 -- John W. Stanley
 505245 -- R. N. Labas - (Chile) 
 505288 -- Felix Franco
 505299 -- Peter Hobbs (UK)
 505454 -- Claudio Ballard
 505608 -- Prof. Karl Kleine
 505917 -- R. N. Labas - (Chile)
 506051 -- Peter Hobbs (UK) 
 506367 -- Stephen Brenner 
 506419 -- Chris Gillings 
 506524 -- Pablo Andres Pichardo 
 506551 -- Michael Meissner (Germany) -- PrimeNumberCurta
 506602 -- German Castro (France)
 506711 -- David Spandl 
 506738 -- Doug Fults
 506838 -- Thomas Mc Namara (USA)
 506849 -- Peter Hobbs (UK)
 506875 -- R. N. Labas - (Chile)
 506936 -- David J. Friedlander 
 507001 -- Matt Ackermann 
 507175 -- Robert Adam 
 507206 -- Harold Urmston
 507214 -- Robert Leiding 
 507435 -- J. Mc Dade 
 507435 -- Richard D. Boltuck 
 507475 -- Skip Hudspeth (USA) 
 507640 -- Craig Seeley
 507656 -- Robert Tiffany
 507968 -- Les & Lisa Van Horn
 507976 -- JackChristensen (USA) 
 508085 -- Skip Godfrey (USA)
 508286 -- William J. Godecker 
 508311 -- Malcolm Brooks 
 508642 -- Rick Stanard
 508629 -- Rex Cornforth (USA)
 508727 -- Tony Arnold
 508835 -- Michael Terry
 508839 -- Jimmy Walker
 508851 -- Ken Sanford (USA)
 508890 -- Hal Antonson
 508954 -- James Black 
 508978 -- Art Rosen 
 508991 -- David Bonnes 
 509156 -- Tom Grimshaw
 509257 -- Daniel Lewin 
 509304 -- Steve Willey 
 509318 -- Rodd Jones
 509452 -- Ron Jones
 509760 -- Joel O'Rourke 
 509808 -- Burt I. Weiner
 509891 -- Stanley Siegel
 509999 -- Andrzej Zbojnowicz
 510241 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 510292 -- John Bellefleur (Canada)
 510305 -- Donald Rosen (USA)
 510365 -- JackChristensen (USA)
 510392 -- Takashi Tanemura (Japan)
 510395 -- Kate Ednie (GB) -- Highest known Black Body
 510633 -- Donald Rosen (USA) -- Lowest known Gray Body
 510675 -- Jorge L. Pang A. 
 510993 -- Ole Steen 
 511181 -- Rick Blake 
 511185 -- Paul Amos 
 511212 -- A Sargeant 
 511219 -- Chris Grow
 511486 -- Victor Kuhl 
 511622 -- Fabio Caruso
 511682 -- Enrico Panfili 
 511697 -- Tim Winker
 511884 -- Thomas Mc Namara (USA)
 512045 -- Steve Willey 
 512225 -- Kathryn Hansen (USA)
 512263 -- Chris Lott
 512265 -- DennyHardy (Europe)
 512304 -- Paulo Boselli
 512407 -- Michael Meissner (Germany) 
 512435 -- Jorge Garcia Sanchez (Spain)
 512529 -- Peter Schneider (USA)
 512687 -- Gary W. Gerfen
 512709 -- Peter Hobbs (UK)
 513025 -- John Nice
 513109 -- Richard Moor (USA) -- PrimeNumberCurta
 513115 -- Greg Finn 
 513279 -- Tullio Parravicini 
 513431 -- Granville Knox (USA) -- PrimeNumberCurta
 513555 -- Bryan C Cloud 
 513709 -- Richard Freedland 
 513710 -- Paul Delmote 
 513923 -- Jay Bayanker
 514112 -- R. N. Labas - (Chile) 
 514128 -- Jacques B. Gros
 514228 -- MSG Larry Turley
 514266 -- Peter Hobbs (UK)
 514406 -- Jorge Garcia Sanchez (Gold demo) (Spain)
 514508 -- Richard Barnhart 
 514533 -- Waldbauer Helmut
 514658 -- Pepper S. Younts (USA) 
 514680 -- Brent Ayscough
 514686 -- JackChristensen (USA)
 514709 -- John H. Eells 
 514725 -- Jim Bell 
 514736 -- Clifford Bruhn 
 514794 -- Peter Schneider (USA)
 514884 -- Waldbauer Helmut 
 514939 -- Andrew Prusek (AU)
 515300 -- Dana G. Tremblay
 515693 -- Henry F. Tutt
 515737 -- Skip Hudspeth (USA) -- PrimeNumberCurta
 515906 -- Peter Hobbs (UK)
 516005 -- Gerard F. Schaefer (USA)
 516080 -- Harold W. Harmon
 516815 -- Peter Hobbs (UK)
 516839 -- Clay Castleberry
 517064 -- Peter Hobbs (UK)
 517170 -- Jim Milstein 
 517305 -- John Favill 
 517327 -- R.S. Clymo
 517561 -- Joseph Williams
 517934 -- Dr. Sid Kolpas 
 517987 -- Scott Harvey, Jr. 
 517994 -- Steve Terry 
 518330 -- Robert Adelstein 
 518485 -- David Owensby 
 518518 -- Glenn Herman 
 518556 -- Mike Rowley
 518792 -- Pepper S. Younts 
 519306 -- William B. "Skip" Freely 
 519445 -- James Black 
 519983 -- Leland May 
 520008 -- Craig Mac Innes 
 520730 -- Steve Willey (USA)
 520886 -- Dale Intolubbe (USA)
 520745 -- Peter Mabey 
 520854 -- Charles L. Webb 
 521043 -- Roger Warling 
 521094 -- Ralph Beckman (USA)
 521415 -- Steve Lower
 521603 -- Larry Walsh -- PrimeNumberCurta 
 521802 -- Rick Bensene
 522528 -- DennyHardy (Europe)
 522545 -- George Huffman (USA)
 522727 -- David Senkfor(USA) 
 522769 -- Mery Christophe 
 522934 -- Ralph Beckman (USA)
 522954 -- Lee Sorenson
 523053 -- Barry Sale (USA)
 523129 -- Douglas Palenshus--sold in 2001 to Bellevue, WA enthusiast 
 523229 -- Josh Fisher
 523847 -- Keith Ward -- PrimeNumberCurta
 524082 -- Jerry Walker (USA)
 524175 -- John Hinkamp
 524265 -- Hiromi Chiyoda 
 524336 -- James H. Glueck 
 524391 -- Joe Mc Glohen 
 524581 -- Rod Sorenson 
 524619 -- Stephen Glover 
 524957 -- Adam -- PrimeNumberCurta
 525059 -- Dov Gadot 
 525190 -- Scott Sprague 
 525329 -- Nick Chapman 
 525581 -- Steve Castleberry 
 525601 -- Dave Wheeldon 
 525638 -- Del Andreini 
 525645 -- Les Talcott (USA)
 526143 -- Les Talcott (USA)
 526157 -- Louis Skelton, Curator at The Keenan Collection -- PrimeNumberCurta
 526339 -- Allen Berman
 526406 -- Grant Paton
 526640 -- Alex Poylisher
 526651 -- Steve Green (UK) -- "TwinPrimeCurta";  the higher of its twin prime 526649
 526699 -- Rick Furr -- USA
 527054 -- Ramon Fregoso 
 527207 -- Gerard F. Schaefer (USA) -- "TwinPrimeCurta";  the lower of its twin prime 527209
 527348 -- Mark Butterworth
 527369 -- Dave Aitchison (Australia)
 527534 -- JackChristensen (USA)
 528118 -- Matthew Presnal 
 528184 -- Herb Gold (Demo model)
 528229 -- David Senkfor (USA)
 528397 -- Bob Lockey 
 528478 -- Steven C. Ross (USA)
 528684 -- Michael L. Harmon (USA)
 528756 -- Billie G. Smith 
 528813 -- Fred Kroll 
 528872 -- Herb Engstrom 
 529069 -- Alfred Werra 
 529115 -- Markus Rustemeyer
 529659 -- Paul Van Hoof 
 529668 -- Donald Rosen (USA)
 529687 -- Harold Mernick
 529860 -- Francisco Ruiz (Mexico) pena2528@hotmail.com
 530023 -- Charles M. Howard
 530070 -- Mike Daley 
 530155 -- Registered Land Surveyor 
 530498 -- Les Kerr 
 531123 -- Cris Grunca
 531203 -- Paul Catchpole (New Zealand) -- PrimeNumberCurta
 531827 -- Wolfgang Deppenmeier -- PrimeNumberCurta
 531993 -- Jay K. Jeffries 
 532235 -- Robert Calliau 
 533039 -- Tadamitsu Gamazawa 
 533418 -- L. Verity 
 533914 -- Robert A. Pearce 
 533946 -- Jo & Jim Hurley 
 533953 -- Harrie Wolters 
 534332 -- Stuart L. Wayne 
 534385 -- Michel Miklaszewski 
 534433 -- Bill Hood
 534622 -- JackChristensen (USA)
 534762 -- Helge Reisch
 535153 -- Doug Thiedecke 
 535297 -- Nick Ridgeway 
 535469 -- Pearu Terts 
 535535 -- James Weightman 
 536087 -- A. B. Bonds 
 536131 -- David Bannister
 536131 -- John H. Eells
 536161 -- Daniel Gross
 536176 -- Chuck Cavanaugh
 536438 -- Scott Norton (USA)
 536689 -- Ira Meislik 
 536734 -- Ken Whitson
 536759 -- Rich Scholl
 536848 -- Gordon Ball (USA)
 537078 -- Adams Douglas 
 538236 -- David Bannister
 538310 -- Pepper S. Younts (USA) 
 538365 -- Paul Krisman 
 538415 -- John A. Smith
 538416 -- Peter Hobbs (UK) 
 538446 -- Chad 
 538659 -- Tony Brown (USA)
 539041 -- Dennis Farr 
 539157 -- Tim Humphries
 539233 -- Donald Rosen (USA) -- PrimeNumberCurta 
 539261 -- Pat Huet 
 539399 -- Joseph A. Charles 
 539451 -- Steve Richards 
 539464 -- David Senkfor (USA)
 539629 -- Kirby L. Crawford
 539787 -- Leo Theron 
 540329 -- Charles G. Hanson (USA) 
 540430 -- Mark Crocker
 540681 -- John Bellefleur (Canada) 
 540738 -- R Monaco 
 540782 -- Jim Walpole (UK)
 541163 -- Grant Youngman 
 541172 -- Franz Schuler 
 541184 -- Jonathan Wall 
 541447 -- Ed Lake
 541599 -- Eric Teutsch
 541614 -- Thomas Mc Namara (USA) 
 541633 -- Miki Mihajlovic 
 541735 -- Joe Webber 
 541758 -- David Kay 
 541833 -- Mark G. Leonard 
 542072 -- Roger David Coleman
 542322 -- Lloyd Albright 
 542379 -- "skeleton" model
 542539 -- Guy Rowinski 
 542608 -- James Mc Dermaid 
 542826 -- Lin Hsin Hsiung 
 542883 -- Bill Drude
 543040 -- Rick Trafford 
 543126 -- Robert Hinchley (Canada)
 543169 -- Ed Sharp 
 543190 -- Allan Gough
 543379 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 543402 -- David Bannister 
 543471 -- Reyn Rich
 543652 -- Peter Johns 
 544167 -- Gary D. Snyder
 544430 -- Peter Hobbs (UK) 
 544447 -- Robert R. Kim 
 544631 -- Cris Vande Velde 
 544783 -- Steve Richards 
 544857 -- Nigel R. Tomlinson 
 544911 -- Benson Miller
 545430 -- John Low-Shang 
 545546 -- Ron Goldsack
 545619 -- Herb GOld
 545773 -- William J. Schull (USA) -- "PrimeNumberCurta"
 546251 -- Al Axelband (USA)
 546283 -- Mohammad hamideyn 
 546616 -- Nathan Orenstein 
 546692 -- John Cherry 
 546763 -- Rudy Penteado
 547205 -- Susan Bastian (USA)
 547347 -- Claudio Abaecherli 
 548103 -- Stan Alter 
 548268 -- Yves Drillet 
 548379 -- Jami Buchet 
 548726 -- Lorenzo Altese 
 548914 -- Nat Edgar 
 549518 -- Mery Christophe
 550040 -- Wayne Loudermilk
 550092 -- Dr. Brian Levy 
 550120 -- Stan Stanley (USA)
 550125 -- James Bowlin
 550865 -- Jim Weil 
 551014 -- JackChristensen (USA)
 551183 -- Juan S. Perez Diaz 
 551188 -- Walt Kammer (USA)
 551663 -- Rod Sorenson 
 551666 -- Dufour Remy 
 551752 -- Philip Twine 
 551956 -- Mery Christophe 
 551957 -- Mery Christophe 
 552457 -- Nick Pritchard 
 552808 -- Steve Richards (USA)
 552856 -- Dr. Jeffry Luria 
 552899 -- George E. Heath 
 553266 -- Gordon Matzigkeit 
 553304 -- Corry Kerstens
 553385 -- Phil Symons 
 553673 -- Eugene F. Hari
 553720 -- Stephen Hunt 
 553736 -- Daniel Kuras 
 554758 -- Doug Boone 
 554764 -- Tim Winker (USA)
 555268 -- Malcolm Brooks 
 555251 -- Dave Coppard -- PrimeNumberCurta
 555406 -- Donald Rosen (USA)
 556023 -- R. Brian Andrews (USA)
 556031 -- Maciej M. Syslo (Poland)
 556053 -- Max Hyre (USA)
 556074 -- Michel Haebrard 
 556327 -- Frederick (Rick) Ide
 556951 -- Lazare
 557211 -- Kamala Krishnan
 557358 -- Ted Taylor
 557360 -- Donald Rosen (USA)
 557607 -- Donald Rosen (USA) (Demonstration model)
 557727 -- Gail Oliver
 557754 -- Ken Seydel
 557762 -- Hull Family 
 557842 -- Marcel Chichak 
 557864 -- Dushan R. Divjak 
 557879 -- Mery Christophe 
 557889 -- Bob Barns 
 558006 -- Douglas Hicks 
 558025 -- Ken Wiedbusch 
 558124 -- Bill Taylor A.S.C.
 558135 -- Ric Goldtrap TSCC
 558189 -- JackChristensen (USA)
 558273 -- Shalom (Dick) Tsur, Ph.D.
 558275 -- Peter Hobbs (UK) 
 558399 -- Gary Caplin 
 558419 -- Paul S. Pace, P.L.S. 
 558450 -- Nigel J S Steward 
 558512 -- Tom Poole
 558551 -- Sean Tudor
 558647 -- Donald Rosen (USA)
 558662 -- Peter Hobbs (UK)
 558711 -- Pepper S. Younts (USA)
 558761 -- Eric Norman 
 558939 -- Herman Brauckmann 
 559891 -- Ken Sanford (USA)
 560051 -- Felix Schaefer 
 560566 -- Thomas Stocker 
 560608 -- Dr. Rutger Verbeek 
 560754 -- David D. Stone Sr. 
 560780 -- Christopher Kaine
 560781 -- Prof. Emeritus Robert A. White (USA)
 560809 -- Roy Levin (USA)
 561213 -- Andrew Koenig 
 561314 -- David Owensby
 561417 -- Peter Hobbs (UK)
 561447 -- Pepper S. Younts (USA) 
 561655 -- Werner Schaefer

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