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

National Metrological Verification Regulations of the People's Republic of China, ?? ??? ???? ??

International Electrotechnical Commission (IEC), ?? ??? ???? ??

Gosstandart of Russia, ?? ??? ???? ??

Taiwan Provincial Standard of the People's Republic of China, ?? ??? ???? ??

Spanish Association for Standardization (UNE), ?? ??? ???? ??

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

RO-ASRO, ?? ??? ???? ??

The Directorate General of Specifications and Metrology (DGSM) , ?? ??? ???? ??

American National Standards Institute (ANSI), ?? ??? ???? ??

Defense Logistics Agency, ?? ??? ???? ??

Bureau of Indian Standards, ?? ??? ???? ??

CZ-CSN, ?? ??? ???? ??

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

Association Francaise de Normalisation, ?? ??? ???? ??

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

German Institute for Standardization, ?? ??? ???? ??

Lithuanian Standards Office , ?? ??? ???? ??

Canadian Standards Association (CSA), ?? ??? ???? ??

European Telecommunications Standards Institute (ETSI), ?? ??? ???? ??

Association of German Mechanical Engineers, ?? ??? ???? ??

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