Guy Peter (1872-1948) invented one of the first mechanical calculators that became part of a modern range of office equipment. He spent a long time experimenting with the machine, taking out many ...
CC0 Usage Conditions ApplyClick for more information. IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This nine-key manual non-printing ...
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