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This Mahogany and brass Fuller's spiral slide rule with serial...
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This machine was made by the Typewriter and Adding Machine Corporation,...
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This black Type II model with serial number 501613 was manufactured...
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This is a circular slide rule made in 1948. The entire scale disk...
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The Loga Company made this slide rule in Switzerland probably during...
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This Type II model with serial number 534960 was manufactured...
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The Planimeter is the first instrument used for measuring area...
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This is a circular brass calculator which was Patented by H and...
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Willgodt T. Odhner invented the pinwheel calculating machines in...