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| All Patents in class 91/29 | |||||
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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 | |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves | |
| 2,730,074 | Jan. 10, 1956 | W. Ernst | Servo-motor valve | hydraulic apparatus | |