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| All Patents in class 122/504 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI53 | May 17, 1842 | T.S. Easton | Preventing steam boiler explosions | ||
| 1,948,725 | Feb. 27, 1934 | J.D. McClintock | Safey Connection | low water alarms | |