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Old 01-13-09, 03:09 AM   #10
Freiwillige
The Old Man
 
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I bleive that the German U-boats had two systems running in conjunction and somebody can correct me if I am wrong but the first and least effective is built into the sides of the hull (GHG) and could not be controlled. It was passive and then the rotating (Balkongerät). They worked in conjunction.
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