Add colorful music to your office, home, or recording studio with this fun Hohner harmonica patent, beautifully printed on canvas with archival ink. It is finished with a distressed vintage effect bringing character and atmosphere.

"Be it known that I, HANS HOHNER, a citizen of the German Empire, residing at Trossingen, lViirtemberg, Germany, have invented certain new and useful improvements in Mouth-Harmonicas; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same."

The patent act of 1790 established the rules for submitting a patent application. Each application had to be submitted with specifications, a patent drawing, and if possible a model of the invention. Eventually, models were no longer required.

The National Archives holds nearly three million patent case files from 1836-1956.