US Trademark Classification US09 Scientific and electronic apparatus 航空氧气面罩（009-5803） Class 09 航空氧气面罩 009-5803 Chinese 航空氧气面罩 English Aviation oxygen masks Term ID 009-5803 Class 09 Type Goods Status Active · added, not since modified (A) Effective date 2020-06-11 Version 11-2020