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| All Patents in class 251/66 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,091,228 | Aug. 24, 1937 | A.G. Hann | Control Device | flow controls | |
| 2,240,763 | May 06, 1941 | E.J. Dillman | Control System | heating apparatus | |
| 2,406,228 | Aug. 20, 1946 | W.S. Landon | Burner Control Means | heating apparatus | |