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| Patents for Henry A. Cowles | |||||
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| Number | Date | Patentee | Title | Type | |
| 343,616 | Jun. 15, 1886 | H.A. Cowles, A.S. Upson | Square | squares | |
| 344,655 | Jun. 29, 1886 | H. Hart | Saw setting device | saw sets | |