Pitch, tar, bitumen and asphalt; concrete building materials, not of metal, namely, blocks, bricks, posts, slabs, and panels; concrete sleepers, namely, concrete track and turnout sleepers; plastic sleepers for tracks and switches; concrete components, namely, prefabricated slabs for roadways and special applications; railway sleepers, not of metal; masts, not of metal, namely, non-metal utility poles, concrete poles for use as building materials; posts, not of metal, for power lines; rigid p...