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International Electrotechnical Commission
IEC Central Office
3, rue de Varembé
1211 Geneva 20
Switzerland
Tel: +41 22 919 02 11
www.iec.ch
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ISO Central Secretariat
Chemin de Blandonnet 8
CP 401
1214 Vernier, Geneva
Switzerland
Tel: +41 22 749 01 11
www.iso.org
INTERNATIONAL TELECOMMUNICATION UNION
ITU
Place des Nations
1211 Geneva 20
Switzerland
Tel: +41 22 730 51 11
www.itu.int