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A kissing shield comprised of a thin, flexible membrane and a frame or holder.
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| Number | Title | Issue Date |
| 4706280 | Electronic step-by-step telephone switching system An electronic step-by-step switching system utilizes much of the equipment now present in conventional electromechanical step-by-step telephone exchange switches. Conventional line finders, selectors and connectors are modified by removing the relay logic... | 11/10/1987 |
| 4440978 | Universal measured service interface for step-by-step telephone exchanges A universal measured service system for a central office exchange senses the condition of relays in the line equipment for each line as well as the conditions of the linefinders. The system associates the outgoing lines of each linefinder with the incomin... | 04/03/1984 |
