07/24/1922 Edison, Thomas Alva to Hunter, Charles Francis
(Brady, Patrick; Meadowcroft, William Henry) Testing and quality control; Metals and minerals [Photocopy; Marginalia by Meadowcroft, William Henry]
[X501A]  Alvin J. Salkind Collection: Notes by Thomas A. Edison
[X501A13B; TAEM 0:0]
Courtesy of Alvin J. Salkind.