This dragon's teeth barrier (Höckerlinie) was part of the German Westwall (Siegfried-Line) and is build in order of the Aachen-Saar-Programm 1938-1939.
The barrier consists of the higher armoured barrier (Panzersperre) from 1938, in the middle the anti-tank ditch (Panzergraben) and on the other side the lower square armoured barrier (Panzersperre) from 1939.
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