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| All Patents in class 110/297 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 6,789X | Oct. 07, 1831 | P. Chase | Coal, anthracite, high steam and hydrogen gas applied to produce combustion | ||
 | 8,742 | Feb. 17, 1852 | J. Millholland | Improvement in Steam Boilers | |