TIixperiments where a radio receiver have been located in caves and in submarines established the fact that very little static is found under the earth and water,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19270923.2.32.8
Bibliographic details
Radio Record, Volume I, Issue 10, 23 September 1927, Page 6
Word Count
27Untitled Radio Record, Volume I, Issue 10, 23 September 1927, Page 6
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