I heard about this form from a friend of mine who turned me on to collecting. Figured I would post my 1st vending machine and many more come.
I did some research and I think i found the patent schematics and grant filing. I got it for $125 and cannot find a value for these or if they are rare or not. I did see similar ones selling for $400 - $600 so I really don't know.
Here is the Patent filing
https://www.google.com/patents/US2700586