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National Metrological Technical Specifications of the People's Republic of China, ?? ???

American Society for Testing and Materials (ASTM), ?? ???

Professional Standard - Petroleum, ?? ???

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

German Institute for Standardization, ?? ???

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

Gosstandart of Russia, ?? ???

National Electrical Manufacturers Association(NEMA), ?? ???

GCC Standardization Organization, ?? ???

CZ-CSN, ?? ???





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