write short note on punch card. Std 4
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punched card (also punch card or punched-card) is a piece of stiff paper that can be used to contain digital data represented by the presence or absence of holes in predefined positions. ... Many early digital computers used punched cards as the primary medium for input of both computer programs and data.
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A punched card (also punch cardor punched-card) is a piece of stiff paper that can be used to contain digital data represented by the presence or absence of holes in predefined positions. ... Many early digital computers used punched cards as the primary medium forinput of both computer programs and data.
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