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| All Patents in class 384/520 | |||||
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| Number | Date | Patentee | Title | Type | |
| 822,723 | Jun. 05, 1906 | R. Conrad | Ball-bearing | industrial machine bearings | |
| 1,622,880 | Mar. 29, 1927 | H.A. Perkins | Radial bearing | woodworking machine mechanisms | |
| 2,696,569 | Dec. 07, 1954 | H.W. Schumann | Motor Tool | handheld grinders | |