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| All Patents in class 73/322.5 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,839,865 | Jan. 05, 1932 | P.E. Chapman | Liquid-level regulator | lamps | |
| 2,416,267 | Feb. 18, 1947 | W.S. Landon | Automatic Orifice Cleaning Device | pipe and orifice cleaners | |