UL标志分为 3类 ,分别是列名、分级和认可标志 ,这些标志的主要组成部分是 UL的图案 ,它们都注册子商标。分别应用在不同的服务产品上 ,是不通用的。某个公司通过 UL认可 ,并不表示该企业的所有产品都是 UL产品 ,只有佩带 UL标志的产品才能被认为是 UL跟踪检验服务下生产的产品 UL mark is divided into three categories, namely, the column name, classification and approval mark, the main part of these signs is the logo of UL, they are registered sub-trademark. Respectively used in different service products, is not universal. The fact that a company is endorsed by UL does not mean that all products in the enterprise are UL products and that only products bearing the UL Mark can be considered as products manufactured under the UL Trace Inspection service