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| All Patents in class 91/173 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 363,368 | May 24, 1887 | W.F. Dake | Double Reciprocating Square Engine | |
 | 395,039 | Dec. 25, 1888 | W.F. Dake | Engine | |
 | 514,054 | Feb. 06, 1894 | N.W. Perkins, Jr., L.C. Atwood | Engine | |
| 1,067,705 | Jul. 15, 1913 | F.J. Zellar | Engine | ||