| All Patents in class 251/234 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 35,071 | Apr. 29, 1862 | J.F. Allen | Improved valve-gear for steam-engines |
 | 130,918 | Aug. 27, 1872 | J.W. Hill | Improvement in apparatus for closing and operating annular series of water-wheel gates |
| | 335,892 | Feb. 09, 1886 | J.P. Kern, J.C. Cosford | Steam Engine Governor |
| | 660,412 | Oct. 23, 1900 | C. Bonjour | Distributing Mechanism for Steam or Other Fluid-Pressure Engines |
| | 703,056 | Jun. 24, 1902 | A. Giesler | Turbine Water Wheel System |
| | 2,766,003 | Oct. 09, 1956 | H. Fritschi, A.H. Dall | Tracer Head Mechanism |
| | 2,916,018 | Dec. 08, 1959 | A.C. Nolte, C.F. Pabst | Control Mechanism |
