This primary source comes from the Records of the Patent and Trademark Office, 1836 - 1978.
National Archives Identifier:
7451831Full Citation: Patent Drawing for L. E. Waterman's Fountain Pen; 2/12/1884; Utility Patent Number 293545; 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://www.docsteach.org/documents/document/waterman-fountain-pen, June 4, 2023]