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| All Patents in class 91/265 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve | |
| 1,927,524 | Sep. 19, 1933 | H.G. Mueller | Steam Engine Inlet Valve Gear | ||