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| All Patents in class 74/572.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 215,805 | May 27, 1879 | G.H. Corliss | Fly-Wheel | ||
| 1,333,135 | Mar. 09, 1920 | J.A. Secor | Foot Guard for Flywheels | safety guards and apparatus | |
| 2,005,941 | Jun. 25, 1935 | G.O. Johnson | Flywheel mounting | punch presses | |