19 Buildings, transportable, not of metal; non-metallic transportable buildings; building panels, not of metal; concrete building elements in the nature of poles for use in building, concrete bollards, concrete beams, concrete blocks, concrete blocks with insulating core, concrete panels, concrete pipes, concrete walls, concrete floors; refractory construction materials, not of metal , namely, refractory mortars, refractory bricks, refractory blocks, semi-refractory bricks, refractory shapes; mouldings, not of metal, for building; linings, not of metal, for building; building materials, not of metal, in the nature of auxiliary building materials for reinforced concrete and masonry construction, namely, spacers, distance pieces for reinforcements, connecting pieces, namely, adapter sleeves for structural sleeves and connecting sleeves for crimp pins or keyed joints of structural steels, air space anchors, wall cramps for facades and for insulating material, insulating connecting pieces, prefabricated concrete parts for erecting building works; wall claddings, not of metal, for building; beams, not of metal; girders, not of metal; partitions, not of metal; staircases, not of metal; stair-treads and steps not of metal; reinforced concrete; reinforcing materials, not of metal, for building; mortar for building; building stone; concrete; sandstone for building; shuttering, not of metal, for concrete; spacers being building elements made of fibre reinforced cement; non-metallic shuttering; non-metallic monocoque buildings; non-metallic building materials having acoustic properties, namely, insulating connecting pieces, prefabricated concrete parts for erecting building works; non-metallic prefabricated building components; preformed concrete building elements, namely, prefabricated concrete parts for erecting building works; prefabricated non-metal buildings; cladding, not of metal, for building; non-metallic structural reinforcement for construction purposes; expansion joints of non-metallic materials for use in construction, namely, non-metal expansion joints for floors and walls; bedding-in compositions for use in building, namely, tar-based concrete and asphalt patching compounds; fibreboard for building; ready-to-use cement for building purposes; non-metallic fireproof panels for use in building; expanded plastics for use in construction; materials, not of metal, for building and construction, namely, pillars not of metal, for building, armour-plating, not of metal, for building, platforms, prefabricated, not of metal; non-metallic ties for use in building; slabs, not of metal, for building; pillars, not of metal, for building; non-metallic beams for building purposes; non-metallic building sections ; non-metallic structural sections for construction purposes; non-metallic reinforcing fabrics for building; concrete building materials in the nature of auxiliary building materials for reinforced concrete and masonry construction, namely, spacers, distance pieces for reinforcements, connecting pieces, namely, adapter sleeves for structural sleeves and connecting sleeves for crimp pins or keyed joints of structural steels, air space anchors, wall cramps for facades and for insulating material, insulating connecting pieces, prefabricated concrete parts for erecting building works, non-metallic building materials in the nature of rock, crystal, fly ash, fiberglass; building materials of concrete reinforced with plastics and glass fibres in the nature of auxiliary building materials for reinforced concrete and masonry construction, namely, spacers, distance pieces for reinforcements, connecting pieces, namely, adapter sleeves for structural sleeves and connecting sleeves for crimp pins or keyed joints of structural steels, air space anchors, wall cramps for facades and for insulating material, insulating connecting pieces, prefabricated concrete parts for erecting building works; concrete poles for use as building materials; concrete beams; concrete walls for building; non-metallic woven fabrics for concrete; concrete retaining walls; aggregates for use in the preparation of concrete