This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier:
6104274Full Citation: Patent Drawing for C. Malings' Tennis Racket; 4/12/1892; Utility Patent Drawings, 1837 - 1911; Records of the Patent and Trademark Office, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/patent-drawing-for-c-malings-tennis-racket, January 18, 2025]