These were made by a division of Firestone, called Electric Wheel Company. The EWC was later merged with Lemmerz of germany, the company is now Titan, still in the steel wheel business.
They now make tractor wheels and tires
http://wheelsthatwonthewest.blogspot...eneration.html
http://www.titanstore.com/
https://www.google.com/search?q=elec...w=1366&bih=657