The former air-raid tower was built in 1939/40 by the Franz Brüggemann company from Hamborn. It offered space for 400 people from the nearby Neunkirch iron works. Between 1936 and 1940, more than 200 of these air raid shelters were built in the German Reich, but only three towers were built in Saarland. The main installation areas were the premises of the Deutsche Reichsbahn and industrial sites important to the war effort. The bunkers were developed by the Cologne architect Leo Winkel, who applied for a patent for the bunker design, gave up his job at Thyssen AG and founded his own company. Winkel designed his bunkers as tapering cones. This shape prevented a bomb penetration. Advantages were easier camouflage options than with conventional bunker systems and the possibility of construction even in difficult ground conditions. In addition, the construction costs were lower.
Source: Wikipedia