| All Patents in class 123/41.72 |
Patents 31 -
39
of 39
      |
| Number | Date | Patentee | Title | Type |
| 643,002 | Feb. 06, 1900 | C.H. Blomstrom, W.J. Perkins | Electric Igniter for Explosive Engines | ignition systems |
| 646,282 | Mar. 27, 1900 | E.T. Headech | Hydrocarbon Motor | oil engines |
| 646,993 | Apr. 10, 1900 | C.A. Scott | Explosion Engine | gas and gasoline engines |
| 654,761 | Jul. 31, 1900 | G. Palm | Combined Steam and Explosive Engine | steam engines |
| 816,062 | Mar. 27, 1906 | I.S. Barnett | Gas Engine | gas and gasoline engines |
| 861,411 | Jul. 30, 1907 | C.W. Weiss | Internal Combustion Engine | oil engines |
| 900,083 | Oct. 06, 1908 | C.A. Clark | Gas Engine | internal combustion engines |
| 1,285,265 | Nov. 19, 1918 | C.I. Longnecker | Combustion-engine | internal combustion engines |
| 2,244,323 | Jun. 03, 1941 | H. Davids, A.K. Antonsen | Internal Combustion Engine | opposed piston engines |
