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| All Patents in class 60/39.091 | |||||
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| Number | Date | Patentee | Title | Type | |
| 927,434 | Jul. 06, 1909 | W. Dieter, H.W. Shonnard | Air-heater for compressed-air engines | hot air engines | |
| 981,339 | Jan. 10, 1911 | E.C. Warren | Internal Combustion Pressure Generator | gas generators | |