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Telecommunications services, microwave
Fibre optics installation contractors, telecommunications
Private telephone system installation contractors, commercial and industrial
Transmitting tower (telecommunication) construction
Telecommunications research and development
Telecommunication systems, satellite, mobile
Integrated services digital network (ISDN) switches
Telecommunications equipment, time division duplex (TDD)
Emergency call systems for motorways
Image transmission and compression-expansion equipment
Voice over DSL (VoDSL) equipment
Voice data systems, private networks
Integrated voice mail systems, private networks
Telephone branch exchanges, private, Internet protocol (IP PBX/VoIp PBX)
Key system/key telephone systems
Telecommunications network equipment, fibre to the curb systems (FTTC)
Telecommunications network equipment, fibre to the home systems (FTTH)
Telecommunications network equipment, fibre in the loop systems (FITL)
Telecommunications network equipment, hybrid fibre-coaxial (HFC)
Photonic networking systems
Local multipoint distribution service (LMDS) network equipment
Telephone switchboards
Educational equipment, telecommunication
