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Braun went to the United States at the beginning of World War I (before the U.S. had entered the war) to help defend the German wireless station at Sayville, New York, against attacks by the British-controlled Marconi Corporation.
The same year, the company also purchased Northstar Technologies, a leading marine electronics provider based in Acton, Massachusetts, from Canadian Marconi Corporation (now CMC Electronics, a wholly owned subsidiary of Esterline Technologies Corporation).