Glass fibers and glass fiber rovings for non-textile purposes; Glass, unworked or semi-worked, except building glass; Glass fibers for reinforcing plastics; Glass fabrics for industrial use; Unworked or semi-worked glass, not for building, namely, glass fibers, glass fiber strands, glass fiber chopped strands and glass fiber rovings, for use as a reinforcement and all for use as materials in further manufacture; glass fibers for non-textile purposes