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| All Patents in class 403/309 | |||||
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| Number | Date | Patentee | Title | Type | |
| 73,100 | Jan. 07, 1868 | G.W. Hubbard | Improvement in shaft-coupling | industrial machine shaft couplings | |
| 126,183 | Apr. 30, 1872 | J. Charlton | Improvement in couplings for shaftings | industrial machine shaft couplings | |
| 691,448 | Jan. 21, 1902 | J.J. Cowell | Shaft-coupling | industrial machine shaft couplings | |