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The Census Bureau first used FOSDIC to process a decennial census in 1960. Enumerators transferred data collected on questionnaires to a "FOSDIC-readable schedule" on which questionnaire responses were recorded as pencilled-in circles. At the Census Bureau, technicians used extremely sensitive photography equipment to convert these forms into microfilm. (In 1970 and later censuses, all questionnaires were FOSDIC readable, illiminating the need to have enumerators tranfer data from questionnaires to FOSDIC schedules).