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Patents for Robert S. Drummond
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,989,651	Jan. 29, 1935	R.S. Drummond	Method of finishing gears
	1,989,652	Jan. 29, 1935	R.S. Drummond	Method for finishing internal gears
	2,111,045	Mar. 15, 1938	R.S. Drummond	Lapping machine

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