1 April 19

The Blaw-Knox Company was out of Pittsburgh Pa.. Its Radiator Towers were patented in July of 1930 with the tallest being 1030 ft and is in Hungry.  They also built free standing conventional (uniform cross-section) towers. They built more conventional towers than the diamond radiator ones…. For more information and pictures use the 3 links below….

WikiPedia 

Radio TimeTraveller

Jim Hawkins’ Radio and Broadcast Page