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| All Patents in class 91/264 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,360,671 | Oct. 17, 1944 | A.C. Janke, C.O. Graves, F.S. Haas | Surface Grinder | grinding machines | |
| 2,442,635 | Jun. 01, 1948 | R.D. Bennett | Spline or gear grinder | gear making machines | |