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33.020 | Telecommunications in general
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33.030 | Telecommunication services. Applications
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33.040 | Telecommunication systems
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33.040.01 | Telecommunication systems in general
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33.040.20 | Transmission systems
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33.040.30 | Switching and signalling systems
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33.040.35 | Telephone networks
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33.040.40 | Data communication networks
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33.040.50 | Lines, connections and circuits
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33.040.60 | Powerline telecommunications
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33.040.99 | Other equipment for telecommunication systems
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33.050 | Telecommunication terminal equipment
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33.050.01 | Telecommunication terminal equipment in general
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33.050.10 | Telephone equipment
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33.050.20 | Paging equipment
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33.050.30 | Equipment for telex, teletext, telefax
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33.050.99 | Other telecommunication terminal equipment
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33.060 | Radiocommunications
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33.060.01 | Radiocommunications in general
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33.060.20 | Receiving and transmitting equipment
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33.060.30 | Radio relay and fixed satellite communications systems
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33.060.40 | Cabled distribution systems
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33.060.99 | Other equipment for radiocommunications
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33.070.01 | Mobile services in general
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33.070.10 | Terrestrial Trunked Radio (TETRA)
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33.070.20 | Paging systems
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33.070.30 | Digital Enhanced Cordless Telecommunications (DECT)
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33.070.50 | Global System for Mobile Communication (GSM)
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33.070.99 | Other mobile services
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33.080 | Integrated Services Digital Network (ISDN)
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33.100 | Electromagnetic compatibility (EMC)
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33.100.01 | Electromagnetic compatibility in general
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33.100.99 | Other aspects related to EMC
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33.120 | Components and accessories for telecommunications equipment
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33.120.01 | Components and accessories in general
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33.120.10 | Coaxial cables. Waveguides
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33.120.20 | Wires and symmetrical cables
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33.120.30 | RF connectors
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33.120.99 | Other components and accessories
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33.140 | Special measuring equipment for use in telecommunications
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33.160 | Audio, video and audiovisual engineering
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33.160.01 | Audio, video and audiovisual systems in general
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33.160.20 | Radio receivers
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33.160.25 | Television receivers
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33.160.30 | Audio systems
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33.160.40 | Video systems
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33.160.60 | Multimedia systems and teleconferencing equipment
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33.160.99 | Other audio, video and audiovisual equipment
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33.170 | Television and radio broadcasting
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33.180 | Fibre optic communications
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33.180.01 | Fibre optic systems in general
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33.180.10 | Fibres and cables
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33.180.20 | Fibre optic interconnecting devices
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33.180.30 | Optic amplifiers
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33.180.99 | Other fibre optic equipment
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33.200 | Telecontrol. Telemetering
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