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Patents for Wilbur C. De Graff
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,819,837	Aug. 18, 1931	W.C. De Graff	Chuck
	2,257,503	Sep. 30, 1941	W.C. De Graff, M.E. Lange	Turning Tool

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