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| All Patents in class 415/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,303,639 | Dec. 01, 1942 | R.D. Wortendyke, C. Herfurth | Grinding Machine | grinding machines | |
| 2,807,240 | Sep. 24, 1957 | E.G. Roehm | Automatic Compensating Mechanism for Milling Machine | metalworking machine mechanisms | |