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| Patents for Powell Macy | |||||
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| Number | Date | Patentee | Title | Type | |
| 270,744 | Jan. 16, 1883 | W.A. Clarke | Cut-off valve | steam safety valves | |
| 272,648 | Feb. 20, 1883 | W.A. Clarke | Reversing-gear for steam-engines | steam engines | |
| 278,223 | May 22, 1883 | W.A. Clarke | Water-gage | gauges | |