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adding machine  An adding machine from the 1940s. Simple adding machines that printed on paper tape were introduced around 1872. The early models were hand-driven, and operated by a crank that printed the number on the tape and added the number to the running total. Some later models replaced the cranks with electric motors. | Device for adding (and usually subtracting, multiplying, and dividing) numbers, operated mechanically or electromechanically; now largely superseded by electronic calculators. |
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