| Patents for A. H. Opsahl |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 407,806 | Jul. 30, 1889 | J. Peebles, E.J. Woolf | Valve Gear for Engines |
 | 455,872 | Jul. 14, 1891 | J. Peebles, E.J. Woolf | Valve Gear for Engines |
 | 475,427 | May 24, 1892 | E.J. Woolf | Single Cylinder Compound Engine |
 | 521,278 | Jun. 12, 1894 | E.J. Woolf | Engine |
 | 531,285 | Dec. 18, 1894 | E.J. Woolf | Engine |
 | 750,449 | Jan. 26, 1904 | W.J. Gillard | Depth Gage |
 | 849,891 | Apr. 09, 1907 | E. Ellingson | Combination Wrench |
 | 864,877 | Sep. 03, 1907 | E.J. Woolf | Explosive Engine |
 | 878,925 | Feb. 11, 1908 | E.J. Woolf | Reversible Explosive Compound-Engine. |
 | 881,214 | Mar. 10, 1908 | E.J. Woolf | Explosive Compound Engine |
