All Patents in class 451/42


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All Patents in class 451/42
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	441,570	Nov. 25, 1890	R.B. Leighton	Lens Grinding Machine
	1,282,037	Oct. 22, 1918	L.W. Bugbee	Grinding Machine
	2,269,556	Jan. 13, 1942	J.A. St. Clair	Method for grinding saws
	2,352,146	Jun. 20, 1944	J. Desenberg	Grinding and Polishing Machine