APPARATUS designed to sound an automatic alarm should the wireless operator be off duty when an 9.0.8. signal is sent out from a ship in distress, is now installed on over a thousand ships. Thus no call for help can go unanswered while ships fitted with the device are within range.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310403.2.23
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Radio Record, Volume IV, Issue 38, 3 April 1931, Page 6
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51Untitled Radio Record, Volume IV, Issue 38, 3 April 1931, Page 6
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