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| All Patents in class 307/112 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 286,273 | Oct. 09, 1883 | P.B. Delany | Electrical Synchronous Movement | ||
 | 2,157,417 | May 09, 1939 | R.F. Kneisley | Automatic circuit selector | |
| 2,479,881 | Aug. 23, 1949 | E.K. Wagner | Electronic Control | ||
| 2,511,821 | Jun. 13, 1950 | E.P. Bullard, III | Control Mechanism | ||
| 3,016,804 | Jan. 16, 1962 | J.G. Osburn, F. Zankl | Program Control System | ||
 | 3,524,072 | Aug. 11, 1970 | A.N. Tsergas | Electrical socket for selectively supplying different voltages | |