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National Museum of American History
The Pocket Calculator Race
ids.si.edu/ids/deliveryService?id=NMAH-DOR2014-036
The Pocket Calculator Race
Machine Computation and Digitization
Sinclair Cambridge pocket calculator
Texas Instruments TI 2500 Datamath
Machine Computation and Digitization
The Pocket Calculator Race
The History Of The Calculator: When was the Calculator First Invented?
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National Museum of American History
John Wolff's Web Museum - Early Electronic Calculators
The History Of The Calculator: When was the Calculator First Invented?
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