Instructing telegraph operators at the General Post Office; St Martins-Le-Grand. 1870.

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: archival, archive, centuryinstructing, general, historical, history, instructing, officegrand187019th, operators, operatorsworking, post, telegraph, telegraphycommunicationinstrumentconnectconnectingtelegraphtelegraphyoperatorspost