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| All Patents in class 123/56.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 563,249 | Jul. 07, 1896 | H.C. Baker | Gas Engine | internal combustion engines | |
| 580,444 | Apr. 13, 1897 | H.C. Baker | Gas Engine | internal combustion engine valves | |
| 821,546 | May 22, 1906 | H.E. Smallbone | Multiple Cylinder Engine | axial internal combustion engines | |
| 1,335,310 | Mar. 30, 1920 | M.A. Yeakley | Internal-combustion engine | internal combustion engines | |