Sending a high speed message on the Wheatstone Automatic telegraph; General Post Office; St Martin's-le-Grand; London. 1879.

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Sending a high speed message on the Wheatstone Automatic telegraph; General Post Office; St Martin's-le-Grand; London. 1879.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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