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| All Patents in class 137/493 | |||||
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| Number | Date | Patentee | Title | Type | |
| 540,760 | Jun. 11, 1895 | S. Sawyer | Automatic air and vacuum valve | radiators | |
| 2,384,169 | Sep. 04, 1945 | G.E. Huck, F.O. Luenberger | Controlling pressure in a fluid-filled motor | electric motors | |