curtain walls, Detroit, Michigan Providence Gas Company Purifier House (1900), 200 Allens Ave., Providence, RI, NRHP-listed Beaman and Smith Company Mill (1898), steel-framed brick building at 20 Gordon Ave., Providence, RI, NRHP-listed Capewell Horse Nail Company (1903), 60-70 Popieluszko St., Hartford, CT, NRHP-listed (Berlin Iron Works) References External links Berlin Iron Bridge Company web presentation The Berlin Iron Bridge Co. Catalogue 1889 Kenneth Franzheim II Rare Books Room ,William R. Jenkins Architecture and Art Library, University of Houston Digital Library. Companies based in Hartford County, Connecticut