19 Concrete building materials, namely, posts, poles, slabs, panels, concrete towers, concrete by cast panels for concrete towers; non-metal posts, non-metal pole masts, non-metal pipes and tubes for housing cables and wires in building; non-metal cladding for building; reinforced, pre-stressed, post-tensioned concrete, namely, posts, poles, slabs, panels, concrete towers, concrete by cast panels for concrete towers; recyclable, environmentally- friendly concrete