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| All Patents in class 123/193.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 132,267 | Oct. 15, 1872 | J.R. Eichenberger | Improvement in Reciprocating Steam Engines | steam engine pistons | |
| 580,090 | Apr. 06, 1897 | J.G. Lewis | Gas or Gasolene Engine | cylinders | |
| 816,062 | Mar. 27, 1906 | I.S. Barnett | Gas Engine | gas and gasoline engines | |