CD-ROMs; printers; floppy disk drives; floppy disk drivers; optical disk drives; optical disk drivers; mouses; feature telephones; modems; telephone answering machines; fax machines; video fax machines; walkie-talkies; private branch exchanges (PABX); cordless telephones; cellular phones; direct inward system access; video optical communication systems; satellite communication systems; video conference equipment; antennae; global positioning systems (GPS); directional finding navigators; telephone dialers; pagers; memory dialers; Fm signal generators; Digital to Analog converters and Analog to Digital converters; radio relay transceivers; coils