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| All Patents in class 431/75 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,093,693 | Sep. 21, 1937 | E.J. Dillman | Control Device | temperature controls | |
| 2,396,205 | Mar. 05, 1946 | P.S. Russel | Controlling Means | flow controls | |