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| All Patents in class 451/905 | |||||
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| Number | Date | Patentee | Title | Type | |
| 272,480 | Feb. 20, 1883 | H.A. Rowland | Apparatus for Grinding Screws | grinding fixtures | |
| 1,486,337 | Mar. 11, 1924 | W.E. Hoke | Machine for Making Gauges and Other Articles | lapping machines | |