Submarine Sound Signalling: Revision history

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10 December 2020

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1 August 2017

10 November 2016

18 June 2015

13 November 2012

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24 July 2012

14 April 2011

  • curprev 20:3020:30, 14 April 2011Tone talk contribs 790 bytes +790 Created page with ''''Submarine Sound Signalling''' was an experimental means of communication at sea trialled around 1911. An Admiralty letter dated 11 October 1911 names some 30-50 ships to be f…'