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| All Patents in class 137/500 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,192,117 | Feb. 27, 1940 | D.D. Wile | Control Device | ||
| 2,259,280 | Oct. 14, 1941 | D.D. Wile | Control Device | ||
| 2,622,614 | Dec. 23, 1952 | W.A. Cox | Rate Valve | ||