Original brick trade vintage catalog for HARBISON-WALKER REFRACTORIES COMPANY. Main office and factory was located in Pittsburgh, PA. Manufacturers of Fire Bricks. Fireclay, High-Alumina, Silica, Chrome and Magnesite Brick, Ground Grog, Chrome Ore, Sagger and Pot Clays, Thermolith and Firebond High Temperature Cements. Disbound from a large 1931 construction equipment book, this unique one page technical data specification brochure would display beautifully matted and framed. Would be a marvelous addition to your industrial engineering library. Slight damp stain on outer edge.