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33 TELECOMMUNICATIONS. AUDIO AND VIDEO ENGINEERING
33.020 Telecommunications in general
33.030 Telecommunication services. Applications
33.040 Telecommunication systems
33.040.01 Telecommunication systems in general
33.040.20 Transmission systems
33.040.30 Switching and signalling systems
33.040.35 Telephone networks
33.040.40 Data communication networks
33.040.50 Lines
33.040.99 Other equipment for telecommunication systems
33.050 Telecommunication terminal equipment
33.050.01 Telecommunication terminal equipment in general
33.050.10 Telephone equipment
33.050.20 Paging equipment
33.050.30 Equipment for telex
33.050.99 Other telecommunication terminal equipment
33.060 Radiocommunications
33.060.01 Radiocommunications in general
33.060.20 Receiving and transmitting equipment
33.060.30 Radio relay and fixed satellite communications systems
33.060.40 Cabled distribution systems
33.060.60 Mobile services
33.060.65 Mobile services
33.060.70 Mobile services
33.060.75 Mobile services
33.060.80 Mobile services
33.060.99 Other equipment for radiocommunications
33.080 Integrated Services Digital Network (ISDN)
33.100 Electromagnetic compatibility (EMC)
33.100.01 Electromagnetic compatibility in general
33.100.10 Emission
33.100.20 Immunity
33.100.99 Other aspects related to EMC
33.120 Components and accessories for telecommunications equipment
33.120.01 Components and accessories in general
33.120.10 Coaxial cables. Waveguides
33.120.20 Wires and symmetrical cables
33.120.30 R.F. connectors
33.120.40 Aerials
33.120.99 Other components and accessories
33.140 Special measuring equipment for use in telecommunications
33.160 Audio
33.160.01 Audio
33.160.10 Amplifiers
33.160.20 Radio receivers
33.160.25 Television receivers
33.160.30 Audio systems
33.160.40 Video systems
33.160.50 Accessories
33.160.60 Multimedia systems and teleconferencing equipment
33.160.99 Other audio
33.170 Television and radio broadcasting
33.180 Fibre optic communications
33.180.01 Fibre optic systems in general
33.180.10 Fibres and cables
33.180.20 Fibre optic interconnecting devices
33.180.30 Optic amplifiers
33.180.99 Other fibre optic equipment
33.200 Telecontrol. Telemetering