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| All Patents in class 280/510 | |||||
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| Number | Date | Patentee | Title | Type | |
| 816,218 | Mar. 27, 1906 | H.C. Clay | Coupling | traction engine couplings | |
| 1,136,564 | Apr. 20, 1915 | M.J. Todd | Vehicle Coupling | wagon and cart couplings | |
| 1,938,407 | Dec. 05, 1933 | F.G. Ricker, J.F. Thomas | Automatic coupler | dollies, carts and hand trucks | |