US Trademark Classification US19 Building materials 混凝土建筑板（019-1785） Class 19 混凝土建筑板 019-1785 Chinese 混凝土建筑板 English Concrete building panels Term ID 019-1785 Class 19 Type Goods Status Active · added, not since modified (A) Effective date 2024-09-19 Version 12-2024