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| All Patents in class 341/116 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,539,788 | Nov. 10, 1970 | J.K. McGee | Method and System for Digitally Signaling Absolute Position | ||
| 3,553,647 | Jan. 05, 1971 | T.B. Bullock | Apparatus for Numerical Signaling of Positions, Including Digital to Analog Converter | ||