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"The Telephone. Home Sweet Home over the Wire",
The Times, Philadelphia, 3 April 1877
The Times (Philadelphia) 3 April 1877.JP
The Times (Philadelphia) 3 April 1877b.J
Gray The Inter Ocean Chicago 20 Feb 1877

Annonce d'une conférence d'Elisha Gray,

The Inter Ocean (Chicago, 3 février 1877

The Brookly Daily Eagle 1 April 1877.JPG

Annonce d'un concert téléphonique entre Philadelphie et Brooklyn, The Brooklyn Eagle, 1st April 1877.

The Times (Philadelphia) 3 April 1877c.J
The Times (Philadelphia) 3 April 1877d.J
The Times (Philadelphia) 3 April 1877e.J
The Times (Philadelphia) 3 April 1877f.J
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