Adding machine
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An adding machine is a class of mechanical calculator, usually specialized for bookkeeping calculations.
In the United States, the earliest adding machines were usually built to read in dollars and cents. Adding machines were ubiquitous office equipment until they were phased out in favor of calculators in the 1970s and by personal computers beginning in about 1985. The older adding machines were rarely seen in American office settings by the year 2000.
Blaise Pascal and Wilhelm Schickard were the two original inventors of the mechanical calculator in 1642.
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