White, George (5 December 1882). "Design No 13,473". pdfpiw.uspto.gov. United States Patent and Trademark Office. Archived from the original on 7 September 2021. Retrieved 7 September 2021.
White, George (5 December 1882). "Design No 13,473". pdfpiw.uspto.gov. United States Patent and Trademark Office. Archived from the original on 7 September 2021. Retrieved 7 September 2021.