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| All Patents in class 137/886 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,938,758 | Dec. 12, 1933 | H. Ernst | Spindle Oscillator | grinding machines | |
| 3,039,489 | Jun. 19, 1962 | L.A. Botkin | Valve structure | ||