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 Calculator Model 4012, c.

"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, 1940-60

"Tim Unitas", Calculating Machine, 1912

4 Calculating Machines, c. 1930

Olivetti Logos 55 Electronic Desktop Calculator, 1974

Alpina Universal Calculator, 1961

2 Early Calculating Machines, c. 1930

Very Interesting Group of Early Adding Machines, 1900-1950

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 Calculator, 1969

Olivetti Logos 245 Electronic Desktop Calculator

2 GDR Calculating Machines

Olivetti Underwood 280 Electronic Desktop Calculator, 1973

6 Calculating Machines

Bunzel Arithmometer, c. 1910

6 Calculating Machines

7 Calculating Machines

"XxX" ('X multiplied by X') Calculating Machine, 1906 onwards

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 Typewriter, c. 1925/30

Calculators, Calculating Tools and Demonstration Model

2 Spoked-Wheel Calculating Machines

4 Calculating Machines

"Curta Type II" (Grey), 1948

"Madas Model IX Te Malaga" Calculating Machine, c. 1925

"Curta Type II" (Grey), 1948

4 Electric Calculating Machines

Olivetti Divisumma 26 Electromechanical Desktop Calculator, 1965