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| All Patents in class 251/54 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,577,455 | Dec. 04, 1951 | E.J. Dillman | Pressure Regulator | refrigeration apparatus | |
| 2,577,680 | Dec. 04, 1951 | G.A. Guernsey, K.A. Harmon | Control mechanism for the brake holders of automotive vehicles | vehicle brakes | |