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Day 1
East German troops erected a temporary barbed-wire fence separating East and West Berlin -
Death Strip Built
An improved wire fence was installed parallel to the first one. The hundred-yard open area later became infamously known as the Death Strip -
Concrete Walls
Authorities install newer concrete barricades on the wall. This took place from 1965-1970 -
Grenzmauer 75
The fourth-generation wall was built from 1975-1980
