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| All Patents in class 403/348 | |||||
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| Number | Date | Patentee | Title | Type | |
| 50,838 | Nov. 07, 1865 | H.W. Olney | Improvement in Attaching Augers to their Handles | auger handles | |
| 78,652 | Jun. 09, 1868 | J.W. Craig | Improvement in braces for bits | brace chucks | |
| 1,741,969 | Dec. 31, 1929 | W.S. Bellows | Detachable Connection for Wrench Sockets and the Like | socket wrenches | |
| 2,138,576 | Nov. 29, 1938 | S.C. Gebert | Conveyor Feed Screw | conveyors and hoppers | |
| 6,000,888 | Dec. 14, 1999 | R.L. Hartman | Quick Coupler Mechanism for Power Tool Bits | ||