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===Power source=== Power sources of calculators are [[electric battery|batteries]], [[solar cell]]s or [[mains electricity]] (for old models), turning on with a [[switch]] or button. Some models even have no turn-off button but they provide some way to put off (for example, leaving no operation for a moment, covering [[solar cell]] exposure, or closing their [[lid]]). [[Crank (mechanism)|Crank]]-powered calculators were also common in the early computer era.
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