support.industry.siemens.com · IEC 60079-15:2001 EN 60079-15:2003, (10) If the sign „X" is...
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support.industry.siemens.com · IEC 60079-15:2001 EN 60079-15:2003, (10) If the sign „X" is placed after the certificate number, it indicates that the equipment or protective system