US Trademark Classification US09 Scientific and electronic apparatus 防尘呼吸面罩（009-6232） Class 09 防尘呼吸面罩 009-6232 Chinese 防尘呼吸面罩 English Dust protective respiratory masks Term ID 009-6232 Class 09 Type Goods Status Active · added, not since modified (A) Effective date 2022-01-01 Version 11-2022