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All Patents in class 451/528 | |||||
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 |