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| All Patents in class 188/335 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,557,241 | Oct. 13, 1925 | J.C. Carlton | Friction Clutch | radial drill presses | |
| 2,984,320 | May 16, 1961 | J.H. Dreymiller, M.T. Whyte | Mechanical Brake | industrial friction brakes | |