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| All Patents in class 236/21R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,138,084 | May 04, 1915 | W.H. Carrier | Safety means for humidity-regulating apparatus | ||
| 2,085,300 | Jun. 29, 1937 | E.J. Dillman | Control Device | flow controls | |
| 2,093,693 | Sep. 21, 1937 | E.J. Dillman | Control Device | temperature controls | |