This primary source comes from the Records of the Patent and Trademark Office, 1836 - 1978.
National Archives Identifier:
7451603Full Citation: Patent Drawing for Samuel L. Clemens's Improvement in Adjustable & Detachable Straps for Garments ; 12/18/1871; Records of the Patent and Trademark Office, 1836 - 1978, Record Group 241. [Online Version, https://www.docsteach.org/documents/document/patent-drawing-for-samuel-l-clemenss-improvement-in-adjustable-detachable-straps-for-garments, April 25, 2024]