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| All Patents in class 303/56 | |||||
| Picture | Number | Date | Patentee | Title | |
| 1,976,123 | Oct. 09, 1934 | F.S. Haas | Grinding Machinery | ||
| 2,959,450 | Nov. 08, 1960 | C.E. Rees, Jr., J.N. Gladden | Power Braking System and Control Unit Therefor | ||