In 1908 Mr. Conn was issued a patent for his invention from the United States Patent & Trademark Office (USPTO). There were 2 documents on file for 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 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…

       " While I shall describe my invention more particularly with reference to sound reproducing machines, commonly known as gramophones and phonographs, at the same time it will be understood that my invention is equally applicable to megaphones and other sound conveying horns and the like. For purposes of brevity, I shall in this specification and the claims following use the term "bell" to include the horns usually employed on sound reproducing machines and, megaphones. As is well known, there are three tones namely, the upper, the middle and lower tones of the musical scale, and heretofore the varied vibrations of the different tones were all taken up in a single chambered bell, with the result that the vibrations of the higher tones are practically lost in a chamber of a size to properly reproduce the lower tone. The object of my invention is to produce a bell having a series of sound wave chambers."…