[Morse telegraph recorder.]
[Morse Relay machine.]
Marconi, Wireless Telegraphing Apparatus.
Marconi, Wireless Telegraphing.
[Man at switchboard.]
[Close up of a teletypewriter switchboard.]
Marconi, Wireless Telegraph Inc.
[Marconi, Wireless Telegraphing.]
Communications, Marconi, Wireless Telegraph Inc.
[Switchboard at the long distance headquarters of the American Telephone and Telegraph Company.]
Communications, Marconi's Wireless Telegraphing Apparatus.
Piece of the Atlantic Telegraph cable
[District selector frame in a dial exchange.]
[General view of sender frames in a panel dial central office.]