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Related articles:
CQD
Pan-pan
Morse code
Mayday (distress signal)
Radio
Global Maritime Distress Safety System
Backronym
1906
July 1
Key terms: sos signal three letter span ships radio pages call cqd sent safety sequence morse code distress signal ttt international operators wireless repeated mayday warned stations overline convention adopted regulations proper sos distress consisting span style visual developed effective vessels letter o correctly individual sos signal distress call continuous sequence international morse Search external links cited by footnotes on Wikipedia page SOS: |
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