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| Patents for Hugh Williams | |||||
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| Number | Date | Patentee | Title | Type | |
| 341,538 | May 11, 1886 | H. Williams, C.H. Andrew | Gas Engine | gas and gasoline engines | |
| 386,949 | Jul. 31, 1888 | H. Williams | Gas Motor Engine | gas and gasoline engines | |
| 457,020 | Aug. 04, 1891 | H. Williams | Gas Motor Engine | gas and gasoline engines | |
| 490,006 | Jan. 17, 1893 | H. Williams | Gas or Similar Motor Engine | ||