In 1900 Mr. Mitchel was issued a patent for his invention from the United States Patent & Trademark Office (USPTO). There were 3 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 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, SAMUEL A. MITCHEL, a citizen of the United States, and a resident of Greenfield, in the county of Highland and State of Ohio, have invented certain new and useful Impvovements in Coffee-Mills, of which the following is a specification. My invention relates to coffee and other grinding mills, and particularly to means for adjusting the grinding-surfaces so as to grind coarser or finer, as desired."…