"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 (Chcago(, 3 février 19877

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