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The first transmission of telegraphic communication to overseas routes was by submarine cable from Dover to Calais in 1850. Private telegraph companies pioneered this work, with the Post Office becoming increasingly involved in the management of overseas cables following its takeover of the UK domestic telegraph network in 1870. Private companies remained active in the international arena, particularly in providing telegraph services to places outside Europe. Many of these companies merged in 1929 to form Cable and Wireless Ltd.