These documents are from envelope 211. They consist of correspondence and agreements relating to Justus B. Entz, who was chief electrician of the Edison Machine Works from 1887 until 1890. The label on the envelope contains the following notation: "Patent Agreement March 15, 1889 Justus B. Entz and Thomas A Edison Royalty to be allowed Mr. Entz for use of certain patents."

Courtesy of Thomas Edison National Historical Park.