Original laboratory trade vintage catalog for THE PERMUTIT COMPANY, main office was located at 440 Fourth Avenue, New York City, NY. Manufacturers of Water Softeners, Filters, Recorders. CO2 Inducators, Ranarex Gas Density Recorders. Zeilite, Lime Soda Water Softeners. Unbound from a large 1931 engineering catalog, this unique old two page technical brochure would exhibit beautifully matted and framed. A fantastic addition to your retro laboratory equipment collection. Slight damp stain on outer edge.