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| All Patents in class 403/306 | |||||
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| Number | Date | Patentee | Title | Type | |
| 50,700 | Oct. 31, 1865 | G.H. Fox | Improvement in shaft-couplings | industrial machine shaft couplings | |
| 50,838 | Nov. 07, 1865 | H.W. Olney | Improvement in Attaching Augers to their Handles | auger handles | |
| 680,815 | Aug. 20, 1901 | L.S. Starrett | Square | squares | |
| 777,215 | Dec. 13, 1904 | C.R. Meston | Shaft-coupling | industrial machine shaft couplings | |