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All Patents in class 451/277 | |||||
Number | Date | Patentee | Title | Type | |
441,570 | Nov. 25, 1890 | R.B. Leighton | Lens Grinding Machine | material grinding machines | |
2,352,146 | Jun. 20, 1944 | J. Desenberg | Grinding and Polishing Machine | polishing and buffing machinery |