[W100AAY] National Archives, Washington, D.C.: Records of the Patent and Trademark Office (Record Group 241) -- Caveats -- Electro Magnetic Paper Perforators for Autographic Writing [case 68][W100AAY; TAEM 0:0]
Courtesy of the National Archives.
[W100AAY] National Archives, Washington, D.C.: Records of the Patent and Trademark Office (Record Group 241) -- Caveats -- Electro Magnetic Paper Perforators for Autographic Writing [case 68]