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