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Search "Comptometer"
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Comptometer: An accounting comptometer with ten positions |
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Comptometer | |
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About 2 pages (639 words) in 2 products |
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Encyclopedia and Summary Information
summary from source:
 Felt's Comptometer Summary
343 words, approx. 1 pages The Felt's comptometer was the first calculator constructed that allowed operands to be entered by pressing keys rather than requiring the operator of previous calculators to turn a series of dials to input the operand values. (Operands are number... summary from source:
 Comptometer Information
296 words, approx. 1 pages
A Comptometer is a type of mechanical (or electro-mechanical) adding machine. The comptometer was the first adding device to be driven solely by the action of pressing keys, which are arranged in an array of vertical and horizontal columns.... 
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Comptometer | |
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About 2 pages (639 words) in 2 products |
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