A French engineer, M. Edouard Belin, has invented an apparatus which ensures the absolute secrecy of wireless and ordinary telegraphic njess ages.
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Bibliographic details
Southland Times, Issue 19773, 22 February 1923, Page 5
Word Count
22Page 5 Advertisements Column 5 Southland Times, Issue 19773, 22 February 1923, Page 5
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