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| All Patents in class 141/128 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,025,893 | Mar. 20, 1962 | L.A. Botkin | Liquid level detector | ||
| 3,060,978 | Oct. 30, 1962 | L.A. Botkin | Automatic valve structure | ||