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| All Patents in class 261/151 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 367,936 | Aug. 09, 1887 | T. Shaw | Hydrocarbon and Gas Impulse Feeder for Gas Engines | ||
| 1,078,608 | Nov. 18, 1913 | W.H. Carrier | Air-cooling apparatus | ||