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| All Patents in class 137/556 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,470,974 | Oct. 16, 1923 | F. Hardinge | Valve | industrial furnaces | |
| 2,613,906 | Oct. 14, 1952 | H.C. Weimar | Hydraulic Control Valve | ||