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| All Patents in class 92/99 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 221,950 | Nov. 25, 1879 | G.S. Woodruff | Gas-governors | ||
| 1,843,068 | Jan. 26, 1932 | R. Gradhe, A. Von Wangenheim | Valve | ||
| 2,213,181 | Aug. 27, 1940 | A. Von Wangenheim | Pressure Relief Device | ||