·UL
The UL, short for Underwriter Laboratories Inc, is the most authoritative non-governmental institutions in American which engaged in safety test and evaluation. It is an independent, non-profit professional institution tests for public safety. It adopts scientific testing methods to research and determine various of materials, installations, products, equipment and buildings whether they do harm to people' life, and insure, write, and publish the corresponding standards and information contribute to reducing and preventing the losses of live and property, at the same time ,it develops the truth investigation business.
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