19 DRY AND WET AIR-SETTING REFRACTORY MORTARS, CASTABLE REFRACTORY MIXES; REFRACTORY MATERIALS FOR USE IN INDUSTRIAL AND CHEMICAL PROCESS EQUIPMENT; NAMELY, VESSEL LINING, FURNACE LINING, LADLE LINING, REFRACTORY CART TOPS, CEMENT, MORTAR, CONCRETE, BRICKS, MINERALS, REFRACTORY CASTABLES; REFRACTORY BRICKS, MORTARS, CEMENT, CLAYS AND MINERALS; RAMMING MIXES; REFRACTORY GUNNING MIXES; AND REFRACTORY SHAPES