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| All Patents in class 188/337 | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 1,217,188 | Feb. 27, 1917 | E.R. Klemm | Braking device | |
| 1,776,415 | Sep. 23, 1930 | G.M. Class | Expanding Ring Friction Device | ||