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| All Patents in class 74/421R | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,011,358 | Dec. 05, 1961 | M.B. Moore | Gearhead | industrial machine gearing | |
| 4,643,037 | Feb. 17, 1987 | C.J. Kis | Gear Change Mechanism | metalworking speed changing mechanisms | |