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| All Patents in class 337/102 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,228,515 | Jan. 14, 1941 | A.K. Foulds | Control Device | temperature controls | |
| 2,344,946 | Mar. 28, 1944 | W.s. Landon | Controlling Means | flow controls | |