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| All Patents in class 340/870.05 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,169,617 | Jan. 25, 1916 | E.W. Comfort | Thermo-electric humidity instrument | ||
| 3,553,647 | Jan. 05, 1971 | T.B. Bullock | Apparatus for Numerical Signaling of Positions, Including Digital to Analog Converter | nc and cnc apparatus | |