Video : Thomas Edison's Quadruplex Telegraph Revolutionizes Communication Networks.
1874
United States of America
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Patent drawing of Edison's Quadruplex
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| Artist: Edison, Thomas A. (Thomas Alva), 1847-1931; Peters, N. (Norris), lithographer; Hammer, William Joseph, 1858-1934, former owner. DSI; Edison, Thomas A. (Thomas Alva), 1847-1931, inscriber. DSI; United States. Patent Office | Credit: https://www.flickr.com/photos/internetarchivebookimages/14569979420/ Source book page: https://archive.org/stream/CollectionUnitev1Edis/CollectionUnitev1Edis#page/n689/mode/1up | Creative Commons License: https://www.flickr.com/commons/usage/
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