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| All Patents in class 137/169 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,252X | Nov. 17, 1830 | J.S. Williams | Mode of supplying water for boilers for steam engines | stationary boilers | |
| 22,284 | Dec. 14, 1858 | J. Frick | Feed-water and blow-off apparatus for steam-boilers | stationary boilers | |