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| All Patents in class 290/40R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 319,260 | Jun. 02, 1885 | A.L. Ide | Governor for Steam and Fluid Engines | |
| 574,320 | Dec. 29, 1896 | A. Giesler | Electric Water Wheel Governor | ||
| 657,662 | Sep. 11, 1900 | F.A. La Roche | Controlling Means for Explosive-Engines | ||
 | 1,451,502 | Apr. 10, 1923 | V.A. Fynn | Speed-regulating apparatus | |
| 1,604,415 | Oct. 26, 1926 | J.J. Kane | Electric Power System | ||
| 1,897,834 | Feb. 14, 1933 | G.A. Biggs | Hydraulic Turbine | ||
| 1,986,915 | Jan. 08, 1935 | G.A. Biggs | Hydraulic Turbine | ||