BASTIDORES, CHASIS Y PANELES PARA EQUIPO ELECTRONICO
RACKS, MODULAR CHASSIS AND PANELS FOR ELECTRONIC EQUIPMENT
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31.240 / Mechanical structures for electronic equipment
CTN 209 - Electronic equipment
IEC 297:1969 (Identical)
IEC 297:1975 (Non-equivalent)
It is cancelled by: UNE 20539-1:1996