This primary source comes from the Records of the Patent and Trademark Office, 1836 - 1978.
National Archives Identifier:
7451838Full Citation: Patent Drawing for L. E. Waterman's Fountain Pen ; 11/4/1884; Utility Patent Number 307735; Utility Patent Drawings, 1837 - 1911; Records of the Patent and Trademark Office, 1836 - 1978, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/waterman-pen, September 17, 2024]