US Trademark Classification US01 Chemicals 亚硫酸钠（001-2220） Class 01 亚硫酸钠 001-2220 Chinese 亚硫酸钠 English Sodium sulfite Term ID 001-2220 Class 01 Type Goods Status Active · added, not since modified (A) Effective date 2020-03-12 Version 11-2020