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| All Patents in class 60/670 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,535X | May 03, 1831 | P.C. Curtis | Steam engine boiler | stationary boilers | |
| 9,015X | Aug. 17, 1835 | G. Cameron | Rotary, rarified air, steam engine | steam engines | |
| 465,194 | Dec. 15, 1891 | E.H. McDonald | Rotary Steam Engine | rotary steam engines | |