Stones and bricks for lining industrial furnaces, especially fireproof and heat resistant stones and bricks; fireproof masses in the nature of refractory construction materials not of metal for the manufacturing of fireproof linings, fireproof mortars, fireproof cement and fireproof concrete

stone and brick for construction; refractory and heat-resistant stone; insulating brick and masonry plates for refractories; and refractory mortar and cement