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38   Commerce, communications & transportation


380   Commerce, communications & transportation

381 Commerce (Trade) 381.1 Marketing channels 381.33 Consumer information 381.34 Consumer protection 381.45002 Booksellers and bookselling 381.456413 Food trade 382 International commerce (Foreign trade) 382.6 Export trade 383 Postal communication 384 Communication. Telecommunication 384.3 Computer communication 384.33 Activities and services 384.5 Wireless communication 384.54 Radiobroadcasting 384.55 Television (Communication) 384.6 Telephony 385 Railroad transportation 386 Inland waterway and ferry transporation 387 Water, air, space transportation 387.155 Navigational aids 387.7 Air transportation 387.8 Space transportation 388 Transportation. Ground transportation 388.1 Roads 388.322 Bus services 388.324 Trucking services 388.4 Urban transportation 389.1 Metrology 389.16 Adoption of metric system (système international, SI) 389.6 Standardization