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Audio and/or video tape players and recorders; audio and/or video disk players and recorders; disk changers for changing and playing disks in the disk players and recorders; radio receivers; disk players incorporating video monitors; amplifiers; equalizers; sound processors including surround-sound processors; channel dividers; digital/analogue converters and frequency processors; digital signal processors; speakers; television receiving sets; monitors for navigation systems and/or televisions; telephones; antennas; recording media with prerecorded computer programs; apparatus for mounting audio and/or visual sets in vehicles; remote control apparatus for audio and/or visual apparatus and/or navigation apparatus; communication cables; navigation apparatus for vehicles; navigation apparatus with displays; navigation apparatus for automobiles including disk player, display and antenna; interconnectors; extension cables; batteries and battery chargers; anti-theft warning apparatus; magazines for holding multiples disks for use with disk changers; digital television receivers; digital television tuners; television monitors; video monitors; monitors for automobile navigation systems and/or televisions; overhead monitors for automobiles; overhead monitors with DVD for automobiles; mobile wireless headphones; wireless communications interfaces; mobile cameras; recording media containing map information for vehicle navigation systems; blank IC memory cards; hardware for mounting audio and video equipment in vehicles sold as a unit with the aforementioned audio and video equipment for vehicles; computer programs for navigation systems