While adding machines, sometimes referred to as printing calculators, may seem outdated and obsolete, they remain indispensable for offices all over the world.

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Other adding machines are found scattered in the NMAH collections. The mathematics collection also has collections of adders, bookkeeping machines, and calculating machines, which are described ...

During the 1920s, several business machine companies consolidated. The Elliott-Fisher Company acquired rights to the Sundstrand adding machine in 1926, and soon merged with the Underwood Typewriter ...