Defence work from the 1930s in defence of Dutch territory or for defence built by the German occupier between 1940 and 1945. The category includes, in particular, the following objects:1)kazemat: self-contained concrete (“bomb-free”) accommodation for the housing of guns, troops or supplies. The German name for casemat is bunker., 2) anti-tank wall: wall of concrete and iron intended to make tanks impossible the passageway. 3) anti-tank moat: watercourse with steep banks to stop tanks 4) dragon sand barrier (Höckerhindernisse), partially excavated, tapered concrete elements to stop tanks.
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