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| All Patents in class 239/522 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 73,957 | Feb. 04, 1868 | S. Darling | Improved Gas Heater | ||
| 2,173,318 | Sep. 19, 1939 | B. Wheeler | Steam Charging Device for Unfired Pressure Vessels | ||