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      • Mar., 1999 Passed U.S. UL ISO 9002 certification.
      • Mar., 2002 Passes U.S. UL ISO 9001 certification.
      • Feb., 2006 Passed U.S. UL ISO 9001:2000 certification.
      • Feb., 2009 Passed U.S. UL ISO 9001:2000 certification.
      • Feb., 2018 Passed U.S. UL ISO 9001:2015 certification.
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