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Radio Record, Volume I, Issue 35, 16 March 1928, Page 9

It is estimated that throughout the world eighteen million radio sets are now in use, approximately seven million of which- or more than one-third, are in operation in the United States, |The best estimates indicate that in 1927 the radio manufacturing industry, did a total business in excess of 600,000,000 dollars (#£12,000,000) approximately 20 per cent, more than last year, And broadcasting makes all thia possible,