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All Patents in class 451/293
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	59,950	Nov. 27, 1866	J. Borthwick	Improved Machine for Sharpening Saws
	182,284	Sep. 19, 1876	J.L. Otis	Planer-knife grinder
	5,048,236	Sep. 17, 1991	C.C. Williams	Saw Blade Tooth Grinder for Saws
	6,676,495	Jan. 13, 2004	M.B. Siemers, E. Irwin, L.G. Lee, L. Sevack	Power sharpening system

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