9 communications equipment, namely, earth stations; digital switching systems comprising single line and multi-line customer premise station equipment for communication links to the public switched network; data transmission systems and networks comprising multiplexers, channel banks, bridges, routers, customer units, data service units and similar devices for broad-band domestic and international communication links and for facilitating the transmission and reception of electronic mail, news, archives and other information; and satellite and mobile communications systems comprising networks of earth stations and satellite links for international and domestic connections, worldwide