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| All Patents in class 200/61.06 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,237,470 | Aug. 21, 1917 | W.H. Carrier | Hygrostat | ||
| 2,031,408 | Feb. 18, 1936 | L.W. Eggleston | Control Device | ||
| 2,279,582 | Apr. 14, 1942 | P.S. Russel | Control Device | ||