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DATAMP Patents by Date for April 1939
This table shows the number of the first patent in the DATAMP database for each date, broken down by patent type.
DateUtilityReissueDesignXAIPatents
42,152,880----[datamp][all]
112,154,367----[datamp][all]
182,154,651----[datamp][all]
252,155,687----[datamp][all]