US Trademark Classification US16 Paper and stationery 办公用电动开信刀（016-3216） Class 16 办公用电动开信刀 016-3216 Chinese 办公用电动开信刀 English Electric letter openers for office use Term ID 016-3216 Class 16 Type Goods Status Active · added, not since modified (A) Effective date 2021-07-22 Version 11-2021