68 INDUSTRY | MT 6821 mechanical engineering | NT1 aeronautical industry | NT1 aerospace industry | NT1 cycle and motorcycle industry | NT1 general mechanical engineering | NT1 machine-tool industry | NT1 motor vehicle industry | NT1 railway indus
68 INDUSTRIE | MT 6821 mechanische industrie | NT1 automobielindustrie | NT1 fiets en bromfiets | NT1 luchtvaartindustrie | NT1 ruimtevaartindustrie | NT1 scheepsbouw | NT1 spoorwegindustrie | NT1 werktuigbouwkunde | NT1 werktuigen | NT1 werktui