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| All Patents in class 137/505.31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 257,494 | May 09, 1882 | R.K. Huntoon | Gas-exhaust regulator | ||
| 565,157 | Aug. 04, 1896 | E.N. Dickerson | Gas Mixer | carburetors | |