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| All Patents in class 374/109 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,165,225 | Dec. 21, 1915 | W.H. Carrier | Humidity meter | ||
| 1,169,617 | Jan. 25, 1916 | E.W. Comfort | Thermo-electric humidity instrument | ||