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| All Patents in class 138/31 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 114,683 | May 09, 1871 | B. Holly | Pressure Regulator | |
 | 383,225 | May 22, 1888 | A.G. Hohenstein | Pressure-regulator | |
 | 1,963,270 | Jun. 19, 1934 | W.P. Huffman, F.F. Rike | Pressure relief attachment | |