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| All Patents in class 474/43 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,434,992 | Nov. 07, 1922 | H.C. Clay | Speed Varying Transmission | industrial machine speed and direction changing mechanisms | |
| 2,032,015 | Feb. 25, 1936 | D.H. Heynau | Friction gear transmission | industrial machine speed and direction changing mechanisms | |
| 3,150,527 | Sep. 29, 1964 | G.L. Trandel | Variable speed device and adjusting means therefor | industrial machine pulleys and belt drive mechanisms | |