All Patents in class 451/528


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All Patents in class 451/528
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
494,471	Mar. 28, 1893	F.N. Gardner, C.H. Besly	Grinding or polishing wheel and the art of manufacturing same
494,472	Mar. 28, 1893	F.N. Gardner, C.H. Besly	Grinding or polishing wheel and the art of manufacturing same
2,073,167	Mar. 09, 1937	H.L. Myers	Surface cleaning means