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| All Patents in class 451/46 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,036,783 | Aug. 27, 1912 | E.J. Bein | Abrasive apparatus | sanding machines | |
| 1,486,337 | Mar. 11, 1924 | W.E. Hoke | Machine for Making Gauges and Other Articles | lapping machines | |
| 2,601,630 | Jun. 24, 1952 | R.J. Rahn, I.J. Rahn | Angle block and method of manufacture | measuring tools | |