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| All Patents in class 48/191 | |||||
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| Number | Date | Patentee | Title | Type | |
| 306,314 | Oct. 07, 1884 | C.G. Beechey | Gas Regulating Valve for Gas Engines | internal combustion engine valves | |
| 1,341,696 | Jun. 01, 1920 | J.T. Wilkin | Proportional governor | pressure regulators | |
| 1,440,297 | Dec. 26, 1922 | C.R. Houghton | Gas-exhauster governor | ||
| 1,457,074 | May 29, 1923 | C.R. Houghton | Constant-flow governor | ||
| 1,648,522 | Nov. 08, 1927 | J.T. Wilkin | Multiple control governor for gas or coke oven systems | machine governors | |