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| Number | Title | Issue Date |
| 5268669 | Sensing apparatus A connector utilizing a number of electrical connectors wires equal to the number used to provide the static binary indications of the particular piece of equipment attached to the device, and further including diodes and direct connections between the el... | 12/07/1993 |
| 4176342 | Electrical control systems for transmitting signals of different magnitudes An electrical control system includes a matrix made up of electrically conductive lines and columns which cross each other at predetermined locations where a plurality of connecting circuits are provided for respectively electrically connecting the lines ... | 11/27/1979 |
| 4025726 | Cathode gate triggering method and system for speech path switches A cathode gate triggering method and system for speech path channel switches using m × n PNPN switches as switching elements, in which l × n PNPN switches in each switch array connected in common at the anode thereof are connected in multiple at the con... | 05/24/1977 |
