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| All Patents in class 123/78R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 291,102 | Jan. 01, 1884 | J. Spiel | Gas Motor | |
| 569,918 | Oct. 20, 1896 | H.C. Hart | Gas Engine | ||
| 661,865 | Nov. 13, 1900 | N.A. Guillaume | Gas Motor | ||
| 1,525,956 | Feb. 10, 1925 | C.E. Sargent | Internal Combustion Engine | ||