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| All Patents in class 261/118 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 731,001 | Jun. 16, 1903 | E.E. Williams | Explosion Engine | |
| 981,188 | Jan. 10, 1911 | F.G. Hobart, W.W. Gore | Gas Cleaning Apparatus | ||