The registration address of changzhou's sources of soundproofing materials is at 222 vuang east road, wuyang town, wuyang city, changzhou city. The registration authority is the administrative approval bureau of the wujin district, changzhou city, represented by legal persons, and operates in the development of soundproofing materials; soundproofing equipment and accessories, environmental protection equipment and accessories, silencers, development, manufacture, processing, sale, installation; steel structural works, stainless steel products, gold, mechanical parts and components, manufacture, processing and sale; import and export operations for self-employment and brokering of goods and technologies, with the exception of goods and technologies for which the state limits companies ' operations or bans imports and exports. (projects subject to legal approval may not operate without the approval of the relevant department)