<img class="wpforo-def
Toledo Furniture might be able to date those for you.
http://www.toledofurniture.com/about-us
I also found this, which might help-
http://industrialchicnewsnatterings.blogspot.com/2011/06/uhl-art-steel-c...
If you need any help, please contact us at – info@designaddict.com