​​​​​​​​​​​Original vintage magazine ad for DOLE VALVE COMPANY.  One-pipe steam system with Dole air and vacuum valves have been designed for years, as if fuel were rationed.  They conserve fuel while delivering balanced heat. Efficient, economical for WW II production plants, shops, offices and emergency landing filed hangars.
Main office was located at 1901-41 Carroll Avenue, Chicago, IL.
​This unique 1942 old one page industrial trade advertisement would display beautifully matted and framed.