CE: 1958 Bohn Contex 10 Calculator - Operates Manually, Still Works ! Has cover !!! - Bohn

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Bohn Contex Mechanical Calculator
Bohn Contex Model 10 Mechanical Calculator. Updated 4/15/2000. The Bohn Contex Model 10 is a miniaturized and simplified version of the large ...

Bohn Contex-10 Desk Calculator | Computer Science
Feb 7, 2010 ... A simple manual calculator (no circuitry) that was released in 1957. It could only perform the four basic operations: addition, subtraction, ...

Repairing a Bohn Context - Csparks
The Bohn Contex is a simple 10-key mechanical calculator produced in Denmark by Brdr. Carlsen A/S in Birkerod, Denmark. I have a model 10, which was ...

Rotary calculators - Bohn Contex 55
This compact Danish machine provided a low-cost alternative to the large and expensive full-keyboard rotary machines. Sigvard Bernadotte, a member of the ...

Four Function Mechanical Calculators
The Museum of HP Calculators ... The first four function mechanical calculator was made by Gottfried Leibniz in 1694. .... Picture of a Bohn Context calculator.