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DATAMP Patents by Date for December 1920
This table shows the number of the first patent in the DATAMP database for each date, broken down by patent type.
DateUtilityReissueDesignXAIPatents
71,361,130----[datamp][all]
141,361,848----[datamp][all]
211,362,600----[datamp][all]
281,363,312-D56,812--[datamp][all]