Original industrial trade vintage catalog for AUTOMATIC PRIMER COMPANY. Main office and factory was located at 111 West Washington Street, Chicago, IL. Manufacturers of Automatic Primers for Apco Centrifugal Pumps and Air Relief Valves. Phantom view of Primer in Use with Pump Running. Disbound from a large 1931 industrial catalog, this unique old one page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro industrial equipment library. Slight damp stain on outer edge.