Simple past tense and past participle of microfilm.(verb)
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Use "microfilmed" in a sentence
"The resulting outcry closed the book on the plan and saved the space, which includes millions of documents, microfilmed newspapers going back 100 years and a reading room."
"Some areas of Kerry for example were never microfilmed but some of the records were digitized."
"And about the time in 1980 when Henry retired from the factory, I convinced him to have it microfilmed."