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| All Patents in class 74/561 | |||||
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| Number | Date | Patentee | Title | Type | |
| 229,614 | Jul. 06, 1880 | W.A. Johnson | Treadle Mechanism for Dental Engine | dental apparatus | |
| 422,465 | Mar. 04, 1890 | F. Thomas | Treadle for Foot Lathes | human powered apparatus | |
| 3,210,712 | Oct. 05, 1965 | J.R. Goff | Foot operated potentiometer and switch | hydraulic presses | |