09/10/1889 Wangemann, Adelbert Theodor Edward to Edison, Thomas Alva -- Telegrams and Cables
(Siemens, Werner von; Helmholtz, Hermann von) TAE friends and associates
[D8905]  Document File Series -- 1889: (D-89-05) Edison, T.A. -- General
[D8905AFW; TAEM 125:347]
Courtesy of Thomas Edison National Historical Park.