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Radio Record, Volume II, Issue 21, 7 December 1928, Page 23

HH radio telephone calls between Great Britain and the United States now average 30a day, and oceasionally the number of international radio conversations may reach to- 60 within the day. To accommodate this increasing traffic as well as to determine the suitability of short waves for regular dependable long-distance communication, the duplex, two-way communication system has been cons structed -in the two countties,