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All Patents in class 451/272
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
534,470Feb. 19, 1895G.H. FowlerHarvester-knife grindersharpeners
2,142,923Jan. 03, 1939R.P. StockingDrill grinding machinedrill grinders
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