Original Patentschrift - Submarine Signal Comp. in Boston , 1902 , Signalaufnahme von Schallwellen , Echolot !!!

Published by Patentinhaber: Submarine Signal Company in Boston , USAPatent: Vorrichtung zur Aufnahme und Übertragung von durch Wasserübermittelten Schallwellen für unterseeische SignalisierungPatentiert am: 18.06.1902Y
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