Marconi, in July 1924, entered into contracts with the British General Post Office ( GPO ) to install high speed shortwave telegraphy circuits from London to Australia, India, South Africa and Canada as the main element of the Imperial Wireless Chain.

Marconi, in July 1924, entered into contracts with the British General Post Office ( GPO ) to install high speed shortwave telegraphy circuits from London to Australia, India, South Africa and Canada as the main element of the Imperial Wireless Chain.

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