Original electrical trade vintage catalog for WM. PENN FLUORESCENT LIGHT MANUFACTURERS COMPANY, was located at 1639 South Broad Street, Philadelphia, PA. Manufacturers of Slimline and Recess fluorescent lighting fixtures, number 97, 2-48 shown. Disbound from a large 1949 electrical construction materials book, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library.