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| Patents for Robert M. Hooper | |||||
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| Number | Date | Patentee | Title | Type | |
| 213,648 | Mar. 25, 1879 | A. Friedmann | Injector | water injectors | |
| 310,910 | Jan. 20, 1885 | C. Piquerez | Watch Case Graving Machine | watchmaking machinery | |
| 371,211 | Oct. 11, 1887 | N. Naudey | Sawing-machine | drag saws | |