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| All Patents in class 137/489 | |||||
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| Number | Date | Patentee | Title | Type | |
| RE4,087 | Aug. 02, 1870 | B. Holly | Water Supply Regulator | water regulators | |
| 3,101,738 | Aug. 27, 1963 | H. Horlacher | Combined Sequence and Check Valve | hydraulic apparatus | |