06/17/1889 Marks, William Dennis to Edison, Thomas Alva
(Vail, John H; Insull, Samuel) Labor; Incandescent lamp; Central stations [Marginalia by Edison, Thomas Alva]
[D8938]  Document File Series -- 1889: (D-89-38) Electric Light -- Edison General Electric Co
[D8938AAT; TAEM 126:423]
Courtesy of Thomas Edison National Historical Park.