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AMPLIFIERS, ANTENNAS, DATA DISPLAY TERMINALS, LOUD-SPEAKERS, RADIOS, RADIO PAGING UNITS, RADIO TELEPHONES, SWITCHBOARDS, TELECOMMUNICATION SATELLITES, TELEPHONES, TELEPHONE ANSWERING MACHINES, TELEPHONE CALL METERING UNITS, TELEPHONE EXTENSION BELLS, TELEPHONE EXTENTION LEADS, TELEPHONE HEAD SETS, TELEPHONE INDUCTIVE COUPLERS, TELEPHONE LAMP SIGNALS, TELEPHONE OPTICAL LINES, TELEPHONE PLUGS, TELEPHONE SOCKETS, TELEPHONE SWITCHES, TELEX TRANSMISSION UNITS, VISUAL DISPLAY UNITS