During the original move from Belvue I had to open up the ceiling to remove a nut from the rod that held the building to the concrete floor and in the right front corner on one of the main I beams I located the following stenciling.
The photo on the left shows the name of the company "Union Metal Mfg. Co., Canton, Ohio"
The photo on the right shows the model number of the building "D-13174". This numbering corresponds with the model numbering used by the company as seen in their catalogs.
Click on each photo to enlarge