Keasbey & Mattison Company letter to Geo. H. Alt, Jr., on Asbestos "Century" Shingles (1916)

A letter from the Keasbey & Mattison Company of Ambler, Pennsylvania, telling Geo. H. Alt, Jr., of Grand Island, New York, that his inquiry about Asbestos Century Shingles had been referred to the company's Buffalo office at 17 Terrace. The illustrated letterhead advertises asbestos "Century" shingles, sheathings, corrugated and flat sheets, roofing slates, millboards and fireproof coverings, made under Hatschek's patent, and pictures the Ambler works as "the largest plant of its kind in the world" alongside plants in the United States and Canada.