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Calculator, mechanical or electronic machine for performing numerical calculations. Calculators have number keys (0 through 9) and additional keys for computing mathematical equations or functions, which are then displayed on a small screen. Calculators, first made available in the early 1960s, were miniaturized and marketed for consumers during the 1970s.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Buffalo grass to Cannizzaro, Stanislao