Building and construction materials, not of metal, namely, refractory bricks, refractory mortars, refractory cements, refractory concrete, refractory shapes, and non-metal refractory furnace linings; refractory building and construction materials, not of metal; refractory ceramic masses, namely, refractory casting compounds, refractory backfilling compounds, and refractory concrete; refractory workpieces of ceramic, namely, ceramic refractory blocks, not of metal, and refractory ceramic tiles...