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In Germany, the development of the first technologies of sonar and radar were interrelated. Following Christian Hulsmeyer''s forgotten invention of the "Telemobiloskop" in 1904, two Berlin engineers, Paul Gunther Erbsloh and Hans-Karl von Willisen, developed and built devices to locate targets accurately by reflections with underwater sound and radi
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In Germany, the development of the first technologies of sonar and radar were interrelated. Following Christian Hulsmeyer''s forgotten invention of the "Telemobiloskop" in 1904, two Berlin engineers, Paul Gunther Erbsloh and Hans-Karl von Willisen, developed and built devices to locate targets accurately by reflections with underwater sound and radi
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