Original concrete trade vintage catalog for THE VORTEX MANUFACTURING COMPANY. Main office was located at 1978 West 77th Street, Cleveland, OH. Manufacturers of Dens-Tect and Par-Lock plaster treatments. Asphalt compounds used are blended of natural asphalts to produce the specific physical qualities necessary to meet the requirement of each type of service. Specifications are provided. This unique 1933 old two page building materials brochure would display beautifully matted and framed. A marvelous addition to your retro engineering library. Pages are loose and contains a small amount of residual glue. Slight damp stain on page edges.