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WikiPedia: Nhãn hiệu GS http://www.bureauveritas.com/wps/wcm/connect/bv_co... http://www.intertek.com/marks/gs/ http://www.percept.com/mark.php http://www.tuv.com/en/corporate/business_customers... http://www.ul.com/global/eng/pages/corporate/about... http://www.dguv.de/DGUV-Test-Medien/_pdf_zip_doc_p... http://www.dincertco.de/en/competencies/our_marks_... http://www.tuvps.co.uk/product-certification.asp