| All Patents in class 91/268 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 426,511 | Apr. 29, 1890 | F.C. Olin | Steam Pump and Motor |
| | 816,348 | Mar. 27, 1906 | J.W. Miller | Cylinder Compression Relief Valve |
 | 1,045,630 | Nov. 26, 1912 | J. Stumpf | Unidirectional-flow steam-engine |
| | 1,111,983 | Sep. 29, 1914 | L. Skinner, E.F. Williams | Automatic Exhaust Valve |
| | 1,119,462 | Dec. 01, 1914 | R.C. Stevens, A.D. Skinner | Steam Engine Valve |
 | 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve |
 | 3,464,315 | Sep. 02, 1969 | H.A. Weyer | Mechanical pneumatic servo control system for high-speed impact devices |
