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The IBM 513 Reproducing Punch ((photo )) was a card punching machine developed by IBM. The machine could perform these functions: * Reproducing all or part of the data on a deck of punched cards. * Gang punching—copying punched information from a master card. * Summary punching—punching a total or new balance card amounts which have been accumulated in the accounting machine. * Mark sensing—the operation by which information recorded in the form of pencil marks is turned into punches on the cards. Mark sensing allowed a person to enter data to be used in punched-card data processing without using a keypunch machine. It was used for tasks such as recording long distance calls or electric meter readings. ==References== * * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM 513」の詳細全文を読む スポンサード リンク
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