Thomas Alva Edison with a microphone, 1930
From his home, Thomas A. Edison, American inventor, sends greetings simultaneously to the World Power Conference in Berlin and the National Light Association in San Francisco via a conference call
Picture No
10515344
Media ID
48018103
Size
1929px x 2502px
(598KB)
Credit
Mary Evans / SZ Photo / Scherl
Date
1930
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