Miller, Benjamin. "Photograph Case." U. S. Patent number: 1737725. Washington, DC: United States Patent and Trademark Office, 1929. http://www.uspto.gov/patft/index.html (18 February 2008).

Miller, Benjamin. "Photograph Case." U. S. Patent number: 1737725. Washington, DC: United States Patent and Trademark Office, 1929. http://www.uspto.gov/patft/index.html (18 February 2008).