Schleswig-Holstein
In 1876, German industrialist Max Duttenhöfer founded the explosives factory "Düneberger Pulverfabrik" near the German city of Hamburg, where gunpowder and other explosives were produced during both world wars.
Erprobungsstelle See
From 1928 until the end of World War II, the German army, hidden deep in a remote corner of the country, tested aircraft, water, and amphibious vehicles.
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