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| All Patents in class 384/438 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,938,723 | Dec. 12, 1933 | E. Ritz, Jr. | Grinding machine | bench or pedestal grinders | |
| 2,730,843 | Jan. 17, 1956 | H. Ernst | Cambering Mechanism | roll grinding machines | |