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| All Patents in class 196/120 | |||||
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| Number | Date | Patentee | Title | Type | |
| 772,040 | Oct. 11, 1904 | F.G. Hobart | Gas Generator | gas generators | |
| 1,382,995 | Jun. 28, 1921 | H.R. Lucke | Process and Apparatus for the Utilization of Heat in Oil Engines | oil engines | |