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| All Patents in class 415/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 580,099 | Apr. 06, 1897 | H.D. Williams | Governor for Water Motors | water wheel governors | |
| 870,291 | Nov. 05, 1907 | G.J. Henry, Jr. | Regulating Means for Water Wheel Nozzles | water wheel governors | |
| 877,873 | Jan. 28, 1908 | E.C. Terry | Steam Turbine | steam turbines | |
| 993,064 | May 23, 1911 | G.J. Henry, Jr. | Automatic Control for Hydraulic Nozzles | nozzles | |
| 2,635,847 | Apr. 21, 1953 | F.H. Rued | Turbine Jet Controller | nozzle controllers | |