BS 7477-1991 IEC 416-1988 ISO 3461-1-1988 Guide for General principles for the creation of graphical
标准简介
BS 7477-1991 IEC 416-1988 ISO 3461-1-1988 Guide for General principles for the creation of graphical symbols for use on equipment —(Implementation of CENELEC HD 571 S1)
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