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| All Patents in class 122/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,570X | May 06, 1833 | S.H. Long | Boilers for generating steam and wheels for locomotive engines | stationary boilers | |
| 7,657X | Jul. 05, 1833 | H.G. of), E.C. (administratrix) | Furnace and condensed air applied to machinery | ||
| 89,240 | Apr. 20, 1869 | T.T. Prosser | Improvement in steam-generators | steam generators | |
| 655,018 | Jul. 31, 1900 | R. Scheidler | Steam Boiler | traction engine boilers | |