bn:05406931n
Noun Concept
Categories: World War II German electronics, Sonar, German inventions of the Nazi period, Microphones, U-boats
EN
Gruppenhorchgerät  Gruppenhorchgerat
EN
The Gruppenhorchgerät was a hydrophone array which was used on Nazi Germany's U-boats in World War II. Wikipedia
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EN
The Gruppenhorchgerät was a hydrophone array which was used on Nazi Germany's U-boats in World War II. Wikipedia
A German sonar Wikipedia Disambiguation
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