| All Patents in class 91/331 |
Patents 16 -
23
of 23
      |
| Number | Date | Patentee | Title | Type |
| 538,694 | May 07, 1895 | F.W. Ofeldt | Vapor Engine | internal combustion engines |
| 902,603 | Nov. 03, 1908 | A.D. Baker, C.J. Pilloid | Valve-Gear | steam engine valve gear |
| 1,008,405 | Nov. 14, 1911 | A.D. Baker | Variable Cut-Off Valve Gear for Engines | steam engine valve gear |
| 1,070,932 | Aug. 19, 1913 | E.F. Williams | Valve Controlling Mechanism for Steam Engines | steam engine valve gear |
| 1,740,744 | Dec. 24, 1929 | F.A. Parsons | Fluid Transmission and Control Means for Machine Tools | milling machines |
| 1,946,659 | Feb. 13, 1934 | L.R. Baker, A.D. Baker | Engine Valve Gear | steam engine valve gear |
| 2,178,850 | Nov. 07, 1939 | A.H. Dall | Spindle Oscillator | grinding machines |
| 2,572,652 | Oct. 23, 1951 | H.G. Mueller | Multiple Expansion Steam Engine | steam engines |
