Berlin Key

Annotation by Deane Barker • •
https://www.youtube.com/watch?v=watch?v=UW4jZLEgaiU&feature=youtu.be
Video

A video showing the usage of a “Berlin Key,” which is a key that unlocks a door, then is pushed through, and has to be used to lock the door on the other side before it can be removed. This ensures the door remains locked after someone passes through it.

This is item #503 in a sequence of 615 items.

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