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Underwriters Laboratories was founded in 1894 in the US by William Henry Merrill to address the growing need for safety and hazard testing and certification of emerging technologies. It originally only addressed electrical and fire safety concerns until it broadened its scope to cover all aspects of the supply chain regardless of industry such as:
Since its first Standard for Safety publication in 1903 regarding the specifications for constructing tin-clad fire doors, UL has created more than a thousand standards from sustainability of certain technology to standards for creating batteries and life safety standards to be followed in building and factory floors. End users rarely see the "Recognized Component Mark" issued by UL since these are usually placed on components that are intended to be a part of another UL-certified final product. For example, consumers generally do not find this mark on cell phones, but will most likely find it in the different components inside, such as the battery and various ICs.
Underwriters Laboratories currently has 64 laboratories that serve 104 countries.