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| Patents for H. Armstrong | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-43,855 | Aug. 07, 1893 | E.S. Pratt | Monkey Wrench | nut wrenches | |
| 502,997 | Aug. 08, 1893 | E.S. Pratt | Monkey Wrench | screw adjust wrenches | |