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IIP (Istituto Italiano dei Plastici): www.iip.it
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UNI (Ente Nazionale Italiano di Unificazione: www.uni.com |
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DVGW (Deutscher Verein des Gas- und Wasserfaches e.V. - Technisch-wissenschaftliche Vereinigung (German Association on Gas and Water, registered association - Technical-scientific Association'): www.dvgw.de |
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KIWA (Netherlands Water Certification Institute): www.kiwa.nl |
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