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Radio Record, 19 August 1938, Page 68

THIS claim is put forward by the NBC for the minute transmitter it has presented to Jules Charbneau, who owns a museum which contains over 25,000 miniature objects. The transmitter,, which is housed in a three-inch cube and. weighs less than 11b., uses a wavelength of 1 metre and has a power of 1-10th watt. Its transmissions were successfully received in New York over a‘distance of over-four miles,