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Sos
1909
Liner "Arapahoe" is 1st ship to use SOS distress call
1909
SOS 1st used by an American ship, Arapahoe, off Cape Hatteras, NC
1906
International Radio Telecommunications Com adopts "SOS" as new call for help
1906
SOS adopted as warning signal by 1st conference on wireless telegraphy
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