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RO-ASRO, ?? ???

Professional Standard - Machinery, ?? ???

HU-MSZT, ?? ???

US-FCR, ?? ???

GB-REG, ?? ???

CZ-CSN, ?? ???

IN-BIS, ?? ???

British Standards Institution (BSI), ?? ???

National Aeronautics and Space Administration (NASA), ?? ???

Korean Agency for Technology and Standards (KATS), ?? ???

KR-KS, ?? ???

Professional Standard - Railway, ?? ???

Group Standards of the People's Republic of China, ?? ???

Military Standard of the People's Republic of China-Commission of Science,Technology and Industry for National Defence, ?? ???

YU-JUS, ?? ???

(U.S.) Plastic Pipe Association, ?? ???

SCC, ?? ???

Association Francaise de Normalisation, ?? ???

American Society of Civil Engineers (ASCE), ?? ???

German Institute for Standardization, ?? ???

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ???





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