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All Patents in class 277/907
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,819,417	Aug. 18, 1931	J.H. Holmgreen	Joint Packing
	2,386,117	Oct. 02, 1945	R.M. Hvid	Engine Piston Construction
	2,570,647	Oct. 09, 1951	G.A. Cormier	Power Cylinder and Piston With Leakage Control

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