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Transmitting apparatus and morse inker used by Marconi for the Lavernock to Brean Down demonstration of wireless telegraphy for the first time across water in May 1897. Inspected by three Post Office officials (identified as being Mr G.N. Partridge, Superintending Engineer, Mr H.C. Price, Engineer, and Mr S.E. Hailes, Lineman). Mounted on discoloured cream card.
