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| All Patents in class 137/115.24 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,804,133 | May 05, 1931 | W. Townsend | Unloading valve | pressure regulators | |
| 1,888,866 | Nov. 22, 1932 | P.S. Russel | Control Means | flow controls | |