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DATAMP Patents by Date for April 1920
This table shows the number of the first patent in the DATAMP database for each date, broken down by patent type.
DateUtilityReissueDesignXAIPatents
61,335,721----[datamp][all]
131,336,754----[datamp][all]
201,337,350----[datamp][all]
271,337,986----[datamp][all]