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| All Patents in class 341/114 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,490,017 | Jan. 13, 1970 | T.B. Bullock, N.C. Kolell | Numerical Control Systems Employing Conversion of Changing Command Numbers Into Phase Analog Signals | nc and cnc apparatus | |
| 3,866,212 | Feb. 11, 1975 | T.B. Bullock, J.B. Simon | Position Control System with Plural Signal Transmission Through Common Inductive Device | electronic circuitry and apparatus | |