What were old calculators called?
Before modern electronic pocket calculators became widely available in the 1970s, early computing and calculating devices went by various names depending on their design and mechanism. Mechanical computing instruments were frequently called adding machines, comptometers, or mechanical arithmometers. Going further back into history, ancient manual counting devices like the frame-based bead-sliding instrument were universally known as abacuses, which served as the primary calculation tool for centuries.
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