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All Patents in class 279/139
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	1,812,455	Jun. 30, 1931	B.F. Stowell	Diaphragm chuck
	1,858,693	May 17, 1932	C.E. Van Norman	Chuck
	2,535,199	Dec. 26, 1950	B.C. Day	Gear holding diaphragm chuck
	2,538,289	Jan. 16, 1951	M.H. Arms	Diaphragm chuck
	2,912,892	Nov. 17, 1959	J.H. Hoern	Continuous Boring and Turning Machines

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