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| All Patents in class 384/518 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,881,750 | Oct. 11, 1932 | E.R. Llewellyn | Antifriction Bearing Mounting | engine lathes | |
| 2,068,594 | Jan. 19, 1937 | J.F. Buhr | Bearing Structure for Rotatable Spindles and the Like | metalworking machine mechanisms | |