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| All Patents in class 137/505.46 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 420,169 | Jan. 28, 1890 | W.C. Rossney | Gas Regulator and Equalizer for Gas Engines | ||
| 564,684 | Jul. 28, 1896 | E.N. Dickerson | Gas Mixing Device | ||
| 658,570 | Sep. 25, 1900 | W. Wishart, J.A. Mosher | Pressure Regulator | ||