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An Albert Nestler Rietz slide rule no. 20/1 with mahogany body,...
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‘Produx’ Pocket calculator made in West Germany. This is the...
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Otis King Slide Rule Calculator Model 'K'. Otis King is a cylindrical...
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This is the earlier version of the Webb adder. It was patented...
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W.F Stanley area computing scale for calculating the area in acres...
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Curta Type II Mechanical Calculator. This Type II model with serial...
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Otis King Slide Rule Calculator Model 'K'. This is a cylindrical...
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Willgodt T. Odhner invented the pinwheel calculating machines in...
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This S&N calculating machine was made by Seidel in 1910 for small...