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| All Patents in class 384/312 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,072,814 | Mar. 02, 1937 | F.S. Haas | Grinding Machinery | grinding machines | |
| 2,160,777 | May 30, 1939 | H. Ernst, A.H. Dall | Journal Bearing | grinding machines | |