Telephone set, Answering machine, Fax machines, Wireless phone, Mobile phone, Teletypewriter, Beeper or wireless pager, Pedestal of mobile phone, Sheath of mobile phone, Radar, Antenna, Disk antenna, Multiplexer, Oscillator, Transistor, Computer monitor, Frequency changer, Equalizer, Attenuator, Vacuum tube, Amplitude amplifier, Wave detector, Filter, Mixer, Frequency divider, Wave booster, Antenna holder, Modem, Signal coupler, Signal receiver, Signal converter, Power amplifier, Cable signal carrier, Global positioning system (GPS) consisting of computers, computer software, transmitters, receivers, and network interface devices, Digital-analog converter, Analog-digital converter, Code reader, Decoder, Cathode ray tube, TV picture tube, Color picture tube, Wireless relay transmitter, Wireless relay receiver, X-ray tube, Light emitting diodes, Encoder, Electron tube, Gateway for interconnection to a network, Wireless LAN (Local-area Network), SET TOP BOX for television, DSL Access Multiplexer-Multiplex Terminal Unit (DSLAM-MTU), Internet phones, Bridges, Routers, Digital Switches, Mobile Switches, ATM Switches, and Data Switches; Communication equipment, namely transmitters, receivers, routers, switchers, modems, converters, and interface devices for - xDSL (Digital Subscriber Line), ADSL (Asymmetric Digital Subscriber Line), SHDSL (Single High Data Rate Digital Subscriber Line), VODSL (Voice Over Digital Subscriber Line), VDSL (Very High Data Rate Digital Subscriber Line), VOIP (Voice Over IP), IP PBX (IP Private Branch Exchange), GPRS (General Packet Radio Services), GSM (Group Special Mobile), CDMA (Code Division Multiple Access), CO (Central Office) links