Patent Drawing for N. P. Otis and R. C. Schmidt's Elevator

Chicago citation style
Department of the Interior. Patent Office. 1849-1925. Patent Drawing for N. P. Otis and R. C. Schmidt's Elevator. 1881-10-18. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6277651. (Accessed July 17, 2018.)
APA citation style
Department of the Interior. Patent Office. 1849-1925, (1881-10-18) Patent Drawing for N. P. Otis and R. C. Schmidt's Elevator. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6277651
MLA citation style
Department of the Interior. Patent Office. 1849-1925. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/6277651>.
Note: These citations are programmatically generated and may be incomplete.