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| All Patents in class 91/236 | |||||
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| Number | Date | Patentee | Title | Type | |
| 155,933 | Oct. 13, 1874 | R. Eickemeyer | Improvement in steam-engines | steam engines | |
| 1,097,543 | May 19, 1914 | J.C. Glenn | Engine Valve | steam engine valves | |
| 1,157,440 | Oct. 19, 1915 | R.C. Stevens | Steam Engine | steam engines | |
| 1,650,642 | Nov. 29, 1927 | H.G. Mueller | Steam Engine | steam engines | |
| 1,686,245 | Oct. 02, 1928 | H.G. Mueller | Reciprocating Steam Engine | steam engines | |
| 2,775,235 | Dec. 25, 1956 | W.F. Jessup | Booster for Template Controlled Truing Mechanism | grinder dressers | |