microcard

noun
mi·​cro·​card | \ˈmīkrōˌkärd\

Definition of microcard 

: a sensitized card approximately 3 in. × 5 in. on which printed matter is reproduced photographically in greatly reduced form

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First Known Use of microcard

1944, in the meaning defined above

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The first known use of microcard was in 1944

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