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| All Patents in class 384/504 | |||||
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| Number | Date | Patentee | Title | Type | |
| 925,376 | Jun. 15, 1909 | J.F. Dearing, M. Harris, R.S. Phillips | Ball Bearing | industrial machine bearings | |
| 1,403,367 | Jan. 10, 1922 | W.A. Whitney | Ball Bearing | industrial machine bearings | |
| 2,012,677 | Aug. 27, 1935 | C.R. Alden | Spindle structure | grinders | |
| 2,651,554 | Sep. 08, 1953 | F.W. Recknagel | Antifriction bearing structure | industrial machine bearings | |