19 Concrete building materials, namely, blocks, bricks, posts, poles, slabs, panels, boards and beams; concrete panels, beams and posts for load-bearing and non load-bearing walls; precast concrete wall, roof and trim panels; concrete roofing; concrete building trim; concrete window frames and sills; concrete pipes; concrete road building materials, namely, barriers, beams, patching compound and slabs; fresh concrete for the production of building materials and pipes and for road building and for improving and reinforcement of soil and rocks