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| Patents for Robert A. Hammond | |||||
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| Number | Date | Patentee | Title | Type | |
| 769,605 | Sep. 06, 1904 | R.A. Hammond, F.E. Walden | Wrench | quick adjust wrenches | |
| 788,716 | May 02, 1905 | F.E. Walden, R.A. Hammond | Worm Gearing | vise mechanisms | |