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| Patents for William S. Halsey | |||||
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| Number | Date | Patentee | Title | Type | |
| 359,926 | Mar. 22, 1887 | W.S. Halsey | Steam Engine | steam engines | |
| 365,681 | Jun. 28, 1887 | W.S. Halsey | Lathe Head Stock | metal lathes | |
| 659,027 | Oct. 02, 1900 | W.S. Halsey | Gas Engine | gas and gasoline engines | |