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| Patents for Hadwin Swain | |||||
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| Picture | Number | Date | Patentee | Title | |
| 519,880 | May 15, 1894 | H. Swain | Gas Engine | ||
| 535,964 | Mar. 19, 1895 | H. Swain | Gas Engine | ||
| 564,769 | Jul. 28, 1896 | H. Swain | Gas or Oil Engine | ||