This full-keyboard direct multiplication non-printing electric calculating machine has an iron and steel case painted black, The nine columns of plastic black and white keys are colored according to ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. In 1895, Otto Steiger, a Swiss ...
Frustrated by human error, mathematician and inventor Charles Babbage designed a machine to perform mathematical functions and automatically print the results. Library of Congress When today’s number ...
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