Photo taken by U.S. Army

S/Sgt. Ralph Lubow, New York City with the Counter Intelligence Corps, 94th Div., US Fifteenth Army, interviews Dr. Peter Hagemaan of Holland. Dr. Hagemaan was ordered to install an electrical alarm system in Hitler's mountain retreat in Berchtesgaden on March 1943 thereby detecting the presence of unwanted persons from a distance of 20 kilometers. Düsseldorf, Germany. 4/27/45.

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