US Trademark Classification US41 Education and entertainment 组织双陆棋比赛（041-2900） Class 41 组织双陆棋比赛 041-2900 Chinese 组织双陆棋比赛 English Organisation of backgammon competitions Term ID 041-2900 Class 41 Type Services Status Active · added, not since modified (A) Effective date 2025-07-31 Version 12-2025