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| All Patents in class 91/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 686,778 | Nov. 19, 1901 | G.F. Steedman | Relief-governor for air-compressors | compressor relief valves | |
| 1,234,882 | Jul. 31, 1917 | W.A. Doble | Speed Governor | water wheel governors | |
| 2,898,891 | Aug. 11, 1959 | R.J. Flanigan, N.V. Gusching | Hydraulic flow control | ||