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adding machine

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adding machine

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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(and usually subtracting, multiplying, and dividing) numbers, operated mechanically or electromechanically; now largely superseded by electronic calculators.



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CPAs constantly enter numbers on a keyboard or an adding machine, which increases the risk of developing a repetitive stress injury (PSI).
The economics of ergonomics: for a happier staff and a more ... by Baron, Laura / Journal of Accountancy
Other new technologies, however, soon followed: "The cash register was patented in 1879, dictating machines and stereotypes in the 1880s, the mimeograph machine in 1890, the Hollerith machine which was used to tabulate the 1890 census, a full-listing adding machine .
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