Electric and electronic data communication apparatus-namely, computer terminal and post interfaces, interface converters and adaptors, protocol converters, code converters, switches, monitoring and diagnostic testers and test meters, modulators, demodulators, interconnecting cables, cable connectors and connector adaptors, cable connector wall boxes and box covers, printers, printer connection adaptors, printer interfaces, circuit boards, transformers, power supplies, automatic computer answer and disconnect interfaces, computer terminal and line sharing interfaces, acoustic couplers, computer terminal timed disconnect monitors, computer terminal printer sharing interfaces, and structural parts for the described electric and electronic data communication apparatus; and all other goods included in this class