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| All Patents in class 137/115.27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,786,402 | Dec. 23, 1930 | P.S. Russel | Regulator | pressure regulators | |
| 2,104,700 | Jan. 04, 1938 | P.S. Russel | Pressure Regulating Device | pressure regulators | |