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DE?? ??
?? 45??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ??, ???, ?? ? ?? ??, ?? ? ??, ?? ??.
American National Standards Institute (ANSI), ?? ??
Canadian Standards Association (CSA), ?? ??
TR-TSE, ?? ??
CZ-CSN, ?? ??
SCC, ?? ??
AT-ON, ?? ??
International Electrotechnical Commission (IEC), ?? ??
European Committee for Standardization (CEN), ?? ??
Canadian Standards Association/American National Standards , ?? ??
BE-NBN, ?? ??
Spanish Association for Standardization (UNE), ?? ??
YU-JUS, ?? ??
Korean Agency for Technology and Standards (KATS), ?? ??
VN-TCVN, ?? ??
IT-UNI, ?? ??
Professional Standard - Ferrous Metallurgy, ?? ??
British Standards Institution (BSI), ?? ??