This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier:
4531648Full Citation: Drawing of Improved Ambulance Carriage; 11/22/1864; Records of the Patent and Trademark Office, Record Group 241. [Online Version, https://www.docsteach.org/documents/document/drawing-of-improved-ambulance-carriage, April 18, 2024]