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| All Patents in class 137/463 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,626,632 | Jan. 27, 1953 | O.M. Hillman | Automatic shutoff valve | ||
| 2,633,866 | Apr. 07, 1953 | R.C. Reasoner | Automatic shutoff valve | ||