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| All Patents in class 384/612 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,268,153 | Jun. 04, 1918 | A.M. Sosa, A.E. Robinson | Ball Bearing | metalworking machine bearings | |
| 2,114,911 | Apr. 19, 1938 | J. Burt | Antifriction Bearing Center for Boring Mills | vertical boring mills | |