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| All Patents in class 337/77 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,842,958 | Jan. 26, 1932 | C.H. Chapman, G.R. Townsend | Thermo relay | motor controls | |
| 2,344,946 | Mar. 28, 1944 | W.s. Landon | Controlling Means | flow controls | |
| 2,372,436 | Mar. 27, 1945 | W.S. Landon | Controlling Means | flow controls | |