3730001 Telecommunication systems, local exchange
3730002 Telecommunication systems, nodal point
3730003 Telecommunication systems, satellite
3730004 Telecommunication systems, synchronous digital hierarchy (SDH) and synchronous optical network (SONET)
3730005 Telecommunication systems, frame relay
3730006 Telecommunication systems, guided wave
3730007 Telecommunication systems, carrier frequency
3730008 Telecommunication systems, wireless, broadband networks
3730009 Telecommunication systems, computer linked
3730010 Telecommunication systems, data transmission
3730011 Data transmission systems and networks, wireless
3730012 Telecommunication systems, integrated services digital network (ISDN)
3730013 Line communication systems, telegraph
3730014 Telemetry systems, line
3730015 Telecommunication systems, alarm
3730016 Telecommunication systems, interactive voice recognition (IVR) and control
3730017 Telecommunication systems, prepayment
3730018 Telecommunication systems, mobile Internet
3730019 Telecommunication systems, railway
3730020 Telecommunication systems, WAP (Wireless Application Protocol)
3730021 Telecommunication systems, short message service (SMS)/text messaging
3730022 Telecommunication systems, marine
3730023 Telephone exchanges, electronic
3730024 Telephone exchanges, automatic
3730025 Telephone exchanges, manual
3730026 Telephone branch exchanges, private (PBX)
3730027 Public network equipment, local loop
3730029 Digital loop carrier equipment
3730030 Public network equipment, central office
3730031 Rural telephone systems
3730032 Communication systems, hazardous area
3730033 Wide area network (WAN) equipment
3730034 Private networks, hybrid equipment
3730035 Radio links, telecommunication
3730036 Telegraph switchboards
3730037 Permutators and distribution frames, telecommunication
3730038 Telecommunication switching systems, line
3730039 Telecommunication switching systems, message
3730040 Telephone switchboards
3730041 Telephone switchgear and accessories
3730042 Telephone main exchange enhancement systems, electronic
3730043 Toll recorders, telephone
3730044 Telephone answering systems
3730045 Telephone answering machines, exact time, information services
3730046 Telephone-television systems
3730047 Training systems, digital communications
3730048 Global system of mobile communication (GSM) routing equipment, telephone network interconnection
3730049 Public network transmission equipment, asynchronous transfer mode (ATM)
3730050 Routers, tetrabit
3730051 Routers, gigabit
3730052 Wavelength division multiplexing (WDM) equipment
3730053 Dense wavelength division multiplexing (DWDM) equipment
3730054 Media gateways
3730055 Multichannel multipoint distribution service (MMDS) equipment
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