This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier:
6277805Full Citation: Patent Drawing for G. Marconi's Wireless Telegraphy; 3/28/1905; Records of the Patent and Trademark Office, Record Group 241. [Online Version, https://www.docsteach.org/documents/document/patent-drawing-for-g-marconis-wireless-telegraphy, May 2, 2024]