| All Patents in class 91/317 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 1,111,983 | Sep. 29, 1914 | L. Skinner, E.F. Williams | Automatic Exhaust Valve | steam engine valves |
| 1,119,462 | Dec. 01, 1914 | R.C. Stevens, A.D. Skinner | Steam Engine Valve | steam engine valves |
| 1,285,475 | Nov. 19, 1918 | W. Turnwald | Automatic exhaust-valve | steam engine valves |
| 2,678,636 | May 18, 1954 | G.H. Fuehrer | Air hammer with selective drill steel rotation | |
| 3,003,773 | Oct. 10, 1961 | G.H. Fuehrer | Coupling assembly with positive lock | |
| 4,483,402 | Nov. 20, 1984 | W. Vonhoff, Jr. | Paving breaker | |
