The Berlin key (German: Schließzwangschlüssel), also known as forced-locking key, is a key for a type of door lock. It was designed to force people to close and lock their doors, usually a main entrance door or gate leading into a common yard or tenement block.
The Berlin key (German: Schließzwangschlüssel), also known as forced-locking key, is a key for a type of door lock. It was designed to force people to close and lock their doors, usually a main entrance door or gate leading into a common yard or tenement block.
Source: Wikipedia "Berlin key" · CC BY-SA 4.0
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