- Tate's Patent Arithmometer, c. 1910...
- Curta Type I Calculator, 1955...
- "Certa" Adding Machine...
- Brass Stepped-Drum Calculating Machine ...
- 4 Mechanical Calculating Machines...
- Edwin Thacher's Cylindrical Slide Rule Calcul...
- "Millionär" Calculating Machine, 1913...
- 4 Electric Calculating Machines...
- Curta "Type I" Calculator, 1970...
- Curta Type II Calculator (Grey), 1970...
- "Millionär" Calculator, c. 1905...
- 6 Mechanical Calculating and Adding Machines,...
- "Tim Unitas", Calculating Machine, 1912...
- 4 Calculating Machines, c. 1930...
- Olivetti Logos 55 Electronic Desktop Calculat...
- Alpina Universal Calculator, 1961...
- 2 Early Calculating Machines, c. 1930...
- Very Interesting Group of Early Adding Machin...
- 4 Mechanical Adding Machines...
- 8 Brunsviga Calculating Machines...
- Olivetti Logos 70 Desktop Calculator, 1973...
- 2 Calculator Demonstration Models, c. 1950...
- 6 Spoked-Wheel Calculating Machines...
- Toshiba BC-1211S Electronic Desktop Calculato...
- Olivetti Logos 245 Electronic Desktop Calcula...
- 2 GDR Calculating Machines...
- Olivetti Underwood 280 Electronic Desktop Cal...
- 6 Calculating Machines...
- Bunzel Arithmometer, c. 1910...
- 6 Calculating Machines...
- 7 Calculating Machines...
- "XxX" ('X multiplied by X') Calculating Machi...
- 4 Mechanical Calculating Machines...
- Curta Type I Calculator, 1963...
- 2 Mechanical Calculating Machines...
- Olivetti Logos 58 Electronic Calculator, 1973...
- 3 Spoked-Wheel Calculating Machines and 1 Typ...
- Calculators, Calculating Tools and Demonstrat...
- 2 Spoked-Wheel Calculating Machines...
- 4 Calculating Machines...
- "Curta Type II" (Grey), 1948...
- "Madas Model IX Te Malaga" Calculating Machin...
- "Curta Type II" (Grey), 1948...
- 4 Electric Calculating Machines...
- Olivetti Divisumma 26 Electromechanical Deskt...