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| All Patents in class 236/DIG.6 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,994,988 | Mar. 19, 1935 | L.W. Eggleston | Control Device | ||
| 2,532,896 | Dec. 05, 1950 | E.J. Dillman | Temperature Operated Valve | ||