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| All Patents in class 192/99R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 162,260 | Apr. 20, 1875 | N.H. Whitten | Improvement in operating paper-calendering rolls | |
| 448,777 | Mar. 24, 1891 | G.W. Drake | Friction Clutch | ||
| 617,419 | Jan. 10, 1899 | F.G. Hobart | Friction Clutch | ||
 | 681,152 | Aug. 20, 1901 | E.E. Thomas | Cone friction-clutch | |
| 834,857 | Oct. 30, 1906 | T.H. Worrall | Clutch | ||
 | 885,075 | Apr. 21, 1908 | D.S. Oakley | Clutch | |
| 1,293,552 | Feb. 04, 1919 | A.M. Sosa, A.E. Robinson | Clutch | ||