UL Numbers From Underwriters Laboratories
"Underwriters Laboratories, an independent firm working with product safety certification, has been active in the field of product testing and preparation of safety standards for more than a century. UL evaluates more than 19,000 types of products, components, materials and systems annually. Every year more than 20 billion UL marks are placed on products from 66,000 different manufacturers. The UL Group and its network of service providers include 68 testing and certification labs worldwide, serving customers in 102 countries."--from the About UL page at Redirecting page to Browser Language detected URL