At the time of the Titanic, Marconi operators did not talk to Telefunken operators, or vice versa, for fear of losing their jobs.1
April 14/15 - The R.M.S."Titanic", having struck an iceberg at 11:40 p.m., begins sending the new international distress signal S.O.S., as well as the older Marconi distress code, C.Q.D..
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Notes
^ ab "Browser wars of the wireless telegraphy age" webpage: TBTF-Tele-Wars.