ON board the Graf Zeppelin there is a ciphering and _ deciphering machine to guard the secrecy of passengers’ private messages. The machine sends a succession of letters unintelligible to anyone save the possessor of the deciphering apparatus. When the Zeppelin first flew over the Atlantic she wsed this machine -to send private newspaper dispatches.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291004.2.66
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Radio Record, Volume III, Issue 12, 4 October 1929, Page 27
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54Untitled Radio Record, Volume III, Issue 12, 4 October 1929, Page 27
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