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| All Patents in class 384/494 | |||||
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| Number | Date | Patentee | Title | Type | |
| 997,920 | Jul. 11, 1911 | H.B. Keiper | Ball and roller bearing | industrial machine bearings | |
| 2,981,544 | Apr. 25, 1961 | B.R. Better | Floating Holders | floating tool holders | |