The table below lists the additions and significant changes that have been made to the Calculators section of this Web Museum. The date of the most recent update is always shown at the bottom of each page.
| Date | Section | Details |
|---|---|---|
| 2012-02-08 | Olympia | Added Olympia CD-400, DTL-SSI (139 chips), 1970, and internal description. |
| 2012-01-27 | Monroe | Revised text, added Monroe LA9-203, 1960. |
| 2011-12-22 | Technical | Added several more reproduction calculator manuals, some in colour. |
| 2011-11-30 | Sharp
Facit |
Revised text, added
Sharp CS-363 16-digit desk calculator (6-chip Rockwell, 1971).
Revised page for related Sharp-built Facit 1135J. |
| 2011-11-09 | Canon | Revised text, added Canon L1630 16-digit desk calculator (5-chip Hitachi, 1973). |
| 2011-10-20 | Technical | Added several more reproduction calculator manuals to the Manuals page. |
| 2011-07-13 | Casio | Added Casio's first "scientific" caclulator, the FX-10 (1974). |
| 2011-05-15 | Various | Added seven 1970s electronic calculators: Sharp EL-814 pocket calculator (LED, 1973), Adler EC-60 portable (1973), Litronix 1100 portable (LED, 1974), Casio Memory-8R pocket calculator (1975), Qualitron 1450 pocket scientific (1976), Imperial (Litton) IC-900 desktop (1973), and Monroe (Litton) 273M desktop printing calculator (1979). |
| 2011-03-20 | Comptometer Operator | Added new page for the Australian Comptometer Competition of 1925. |
| 2011-02-23 | Felt & Tarrant (Comptometer) | Revised text, added 4 photos, added Comptometer Model A (1905) and Comptometer Model E (1914). |
| 2011-01-30 | Victor | Added Tallymaster Model 37-57-0 manual add-list machine (1960s), and Tallymate Model 85 portable electronic calculator (1972). |
| 2010-11-29 | Technical | Updated Olivetti Logos 240 technical description, added details of MOS-LSI main board (1973). |
| 2010-11-27 | Monroe | Updated text, added LN-160X portable (1950s) and reproduction CSA-8/10 manual. |
| 2010-09-17 | Technical | Added several more reproduction calculator manuals. |
| 2010-06-07 | Casio | Revised text, added Casio Mini (1972) and Casio Memory 8F (c.1975) |
| 2010-06-04 | Friden | Added Singer/Friden 1200 electronic portable calculator, 1973 |
| 2010-05-07 | Printing Calculators | Added Precisa 208-10, 1968. |
| 2010-05-07 | Casio | Added Sperry-Remington 1125-M (variant of Casio Pocket Mini), 1975. |
| 2010-04-11 | Casio | Added Casio 101 electronic desk calculator, discrete-component DTL, 1966. |
| 2010-04-07 | Technical | Revised and expanded the rebuilding procedure for the Felt & Tarrant Comptometer. The new notes can be used with any of the manual rock-frame models from 1919 onwards. |
| 2010-02-28 | Technical | Added technical description of Anita 1011-LSI (c.1970). |
| 2010-02-28 | Bell Punch Company | Revised text, added Anita 1000 and 1011-LSI (c.1970). |
| 2010-02-04 | Burroughs | Revised text, added 7 more Burroughs Portables (1920s-1960s) and one J-1000 series (1960s). |
| 2009-12-30 | Casio | Revised text, updated ilustrations, added Casio Mini models
CM-603,
CM-605, and
Root-M (1973-74).
Added FX-101 scientific calculator (1976). |
| 2009-12-20 | Sharp | Revised text, added EL-122 6/12-digit portable and CS-523 desktop printing calculators (1974). |
| 2009-11-16 | Olympia | Added Olympia CP-1210 electronic printing calculator (1976). |
| 2009-10-28 | Technical | Added new page with details of reproduction calculator manuals. |
| 2009-10-22 | Electronic | Added 6 mid-1970s machines to the Portable electronic calculators page. |
| 2009-09-25 | Technical | Updated Rebuilding the Facit C1-13 with notes on reassembling the rotor linear bearing. |
| 2009-09-19 | Victor | Added new page for theVictor Adding Machine Company, with 11 mechanical and 2 electronic machines. |
| 2009-09-15 | Key-driven calculators | Added Dacometer Model 508 half-keyboard adder for Sterling currency. |
| 2009-09-09 | Original-Odhner | Revised text, added Original-Odhner Model 23. |
| 2009-08-26 | Printing Calculators | Added Remington Monarch Model 93. |
| 2009-08-15 | Printing Calculators | Revised and reorganised Printing Calculators section with 12 new machines from Barrett, Sundstrand, and others. |
| 2009-08-02 | Calculating Machines | Reorganised Calculating Machines main page. |
| 2009-07-25 | Electronic | Reorganised
electronic calculator section.
Revised and updated Canon page. Added new pages for Compucorp and Casio calculators. |
| 2009-07-11 | Facit | Added Facit Model 1124, electronic, DTL-SSI (151 chips), 1968. |
| 2009-07-05 | Technical | Revised and restructured
Original-Odhner pinwheel mechanism description.
Added new page on Rebuilding the Original-Odhner Model 239 pinwheel calculator. |
| 2009-06-17 | Olivetti | Revised text, added Logos 240 (electronic, 1970). |
| 2009-06-17 | Technical | Added Olivetti Logos 240 technical description. |
| 2009-04-27 | Pinwheel | Added Muldivo Mentor (a re-badged Walther WSR-160). |
| 2009-04-14 | Bell Punch Company | Updated text, added more patent and nameplate details. |
| 2009-04-01 | Technical | Added step-by-step rebuilding procedure for the PLUS Rapid Adder. |
| 2009-03-29 | Key-driven | Re-structured Key-driven calculators (previously Comptometers) section, numerous minor updates and changes. |
| 2009-03-27 | Pinwheel | Added Triumphator 9x8x13, s/n 8252. |
| 2009-03-15 | Contex | Updated text and photos, added 2 more variants of Contex Model A. |
| 2009-03-05 | Technical | Revised Madas ATG Description of Operation. |
| 2009-01-24 | Technical | Added mechanism description and step-by-step rebuilding procedure for Addo Multo Model 113 pinwheel calculator. |
| 2008-12-29 | Olivetti | Revised text, added Divisumma 422 (electronic). |
| 2008-12-23 | Brunsviga | Added Brunsviga Model B (early version). |
| 2008-12-23 | Pinwheel | Added Thales Model A. |
| 2008-11-24 | Miniature | Added new page for Miniature full-function calculators - Curta, Multifix, and Alpina. |
| 2008-10-30 | Lagomarsino | Added new page for Lagomarsino - Numeria and Totalia calculators. |
| 2008-10-15 | Brunsviga | Revised text, added Brunsviga MIII. |
| 2008-10-10 | Friden | Revised text, added photo of Carl Friden. |
| 2008-09-29 | Technical | Added mechanism description for
Facit Model C1-13 pinwheel calculator (hand-cranked). Added mechanism description for Facit Model CA2-16 pinwheel calculator (fully-automatic). Added step-by-step procedure for Rebuilding the Facit Model C1-13. |
| 2008-09-26 | Technical | Added new page of Notes on overhauling a mechanical calculator. |
| 2008-05-26 | Sharp | Updated entries for PC-1001 and CS743R |
| 2008-04-15 | Walther | Added new page for Walther calculators |
| 2008-03-25 | Hans W Egli | Revised text, added MADAS 20BTG (two versions), added two 1940s advertising fliers. |
| 2008-03-10 | Comptometers | Expanded Comptometer Operators section with 3 new pages. |
| 2008-03-04 | Comptometers | Added Addicalco Model 53 |
| 2008-03-02 | Small adding machines | Added two BriCal 6-dial adders (Sterling and decimal versions) |
| 2008-02-26 | Olympia | Added new page for Olympia calculators |
| 2007-12-14 | Ten-key | Added Walther Diwa 32 |
| 2007-11-25 | Facit | Added Facit CM2-16S |
| 2007-11-21 | Hans W Egli | Revised text, updated Millionaire register. |
| 2007-11-04 | Comptometers | Added a new contributed article from a former comptometer operator. |
| 2007-10-25 | Home | Added Enquiry and feedback form. |
| 2007-10-25 | Marchant | Added notes on designer Joseph Sinel and DC distribution. |
| 2007-10-25 | Facit | Added Facit 1111 (OEM version of Sharp EL-8) |
| 2007-10-24 | Electronic - desktop | Added Compucorp "Alpha 325 Scientist" |
| 2007-09-25 | Ten-key | Added new category page for full-function ten-key calculators |
| 2007-09-10 | Contex | Revised text, new photos of four ten-key machines |
| 2007-09-07 | Facit | New photos of CA2-16 and 10-07 |
| 2007-08-29 | Slide Rules | Revised text, added Fearns-Mear Pipe Flow Calculator |
| 2007-08-28 | Small Adders | Added Add-O-Matic Pencil Case |
| 2007-08-27 | Facit | Revised CM2-16 and CM2-13S |
| 2007-08-20 | Sharp | Added new page for EL-808 LCD |
| 2007-08-07 | Olivetti | Added M24, E24CR, D26GT. |
| 2007-07-20 | Burroughs | Added J524, J700, J1624. |
| 2007-06-27 | Small adding machines | Extensive revisions and additions. |
| 2007-06-19 | Friden | Added Friden D10 |
| 2007-06-19 | Added "What's new" page. | |
| 2002-12-14 | Site on-line. |