The History of the Marchant Calculator
A complete analysis of the origin, development, rise and decline of the manual and electromechanical rotary lever-set and proportional gear calculating machines
compiled by Ernest E. Jorgenson
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The History of the Marchant Calculator
A complete analysis of the origin, development, rise and decline of the manual and electromechanical rotary lever-set and proportional gear calculating machines
compiled by Ernest E. Jorgenson
|