In 1930 Mr. Schnell, was issued a patent for this invention from the United States Patent & Trademark Office (USPTO). There are 2 documents included with this patent. The drawing specification sheet of the patent has been reproduced from original USPTO documents and printed onto parchment paper. This print is sized and ready to install into an 8" x 10" frame. The additional sheets included are printed on 5.50" x 8.50" parchment paper. These accompanying documents describe the scope of this invention in formal terms. The following is an actual excerpt from the patent…

       " Be it known that I WILLIAM SCHNELL. a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a new, original, and ornamental Design for a Radiator Cap or Similar Article for an Automotive Vehicle, of which the following is a specification, reference being made to the accompanying drawings, forming part there of"…