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Patents for National Broach & Machine Co., Inc.
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,989,651Jan. 29, 1935R.S. DrummondMethod of finishing gearsgear making machines
1,989,652Jan. 29, 1935R.S. DrummondMethod for finishing internal gearsgear making machines
2,111,045Mar. 15, 1938R.S. DrummondLapping machinegear making machines
2,273,399Feb. 17, 1942C.B. De VliegMachine toolmilling machines
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