Card of Authority to use portable receiver, 1922

Card of authority to use portable receiver, issued by the General Post Office, British, 1922. Issued on April 13 1922 to the Hon. E H Cozens-Hardy, of Letheringsett Hall, Holt, Norfolk. The card reads 'The bearer, the Hon E H Cozens-Hardy of Letheringsett Hall, Holt, Norfolk, has been authorised by the Postmaster General to conduct experiments with portable wireless receiving apparatus within a radius of ten miles of (1) Messrs Pilkington Bros Works, St Helens, (2) Letheringsett Hall, Holt, Norfolk (but not within one mile of any Government wireless station)