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Jennifer's 20th Century History Blog

By Jennifer Rosenberg, About.com Guide to 20th Century History since 1997

SOS Accepted as Universal Distress Signal

Thursday March 22, 2007
After being agreed upon at the 1906 Radiotelegraphic Conference, the Morse code signal of three dots, three dashes, and then three dots (sent together, without spacing) went into effect as the international signal for distress on July 1, 1908.

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