This key-driven, non-printing adding machine is an early example of a Comptometer with a metal case. It has eight columns of plastickeys. The keys in the two rightmost columns, which represent cents, ...

Put away the laptop, the calculator and the adding machine – and try filing your taxes using an abacus. That’s right, an abacus. We haven’t always been as high-tech as we are today. Before there was ...

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 adding machine section has a ...