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| All Patents in class 137/505.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 21,281 | Aug. 24, 1858 | W.G. Sterling | Gas Regulator | ||
| 312,906 | Feb. 24, 1885 | E. Schrabetz | Gas Governor for Gas Engines | gas and gasoline engines | |
| 565,157 | Aug. 04, 1896 | E.N. Dickerson | Gas Mixer | carburetors | |