The table below lists the major additions and changes that have been made to this Web Museum. The frequent minor changes and updates are generally not recorded here. The date of the most recent update (major or minor) is always shown at the bottom of each page.
| Date | Section | Details |
|---|---|---|
| 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. |