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All Patents in class 451/431
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	126,522	May 07, 1872	W.E. Cooper	Improvement in Devices for Boring Spherical Seats
	801,350	Oct. 10, 1905	T.B. Williams	Valve-reseating machine
	1,981,269	Nov. 20, 1934	J.W. Holland	Valve seat grinder
	2,318,854	May 11, 1943	E.A. Hall	Portable Valve Seat Grinding Means

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