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| All Patents in class 264/29.1 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,045,452 | Jun. 23, 1936 | G.W. Emrick | Clutch | tapping heads and chucks | |
| 2,045,453 | Jun. 23, 1936 | G.W. Emrick | Method of making friction clutch elements | tapping heads and chucks | |