Measuring only 2in 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/ESD19340622.2.38.2
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Evening Star, Issue 21753, 22 June 1934, Page 6
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32Page 6 Advertisements Column 2 Evening Star, Issue 21753, 22 June 1934, Page 6
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