US Trademark Classification US09 Scientific and electronic apparatus 实验室用氢气发生器（009-6280） Class 09 实验室用氢气发生器 009-6280 Chinese 实验室用氢气发生器 English Hydrogen generators for laboratory use Term ID 009-6280 Class 09 Type Goods Status Active · added, not since modified (A) Effective date 2022-04-14 Version 11-2022