Measuring only two inches in height, the smallest radio valve in the world is now being turned out by British manufacturers; it has a range of 100 miles, and amplifies speech fifteen times.
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https://paperspast.natlib.govt.nz/newspapers/EP19340619.2.13
Bibliographic details
Evening Post, Volume CXVII, Issue 143, 19 June 1934, Page 3
Word Count
33Untitled Evening Post, Volume CXVII, Issue 143, 19 June 1934, Page 3
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