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| All Patents in class 91/305 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,938,758 | Dec. 12, 1933 | H. Ernst | Spindle Oscillator | grinding machines | |
| 2,303,639 | Dec. 01, 1942 | R.D. Wortendyke, C. Herfurth | Grinding Machine | grinding machines | |