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| All Patents in class 137/505.41 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 94,748 | Sep. 14, 1869 | B. Holly | Automatic Regulating Valve | |
| RE4,396 | May 23, 1871 | B. Holly | Improvement in Automatic Regulating-Valves | ||
| 221,950 | Nov. 25, 1879 | G.S. Woodruff | Gas-governors | ||