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| All Patents in class 451/177 | |||||
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| Number | Date | Patentee | Title | Type | |
| 704,785 | Jul. 15, 1902 | C.H. Driver | Sandpapering-machine | belt sanders | |
| 2,111,045 | Mar. 15, 1938 | R.S. Drummond | Lapping machine | gear making machines | |