US Trademark Classification US01 Chemicals 氢化偶氮苯（001-2275） Class 01 氢化偶氮苯 001-2275 Chinese 氢化偶氮苯 English Hydrazobenzene Term ID 001-2275 Class 01 Type Goods Status Active · added, not since modified (A) Effective date 2021-04-01 Version 11-2021