Yesterday I found a fascinating gate along my hiking trail: simple mechanical engineering that mimics advanced .

Let's say 4 different officers want to share the ability to unlock this gate independently, but they don't want to use a shared key for some security reasons. For example, they might want to quickly disable or replace one of the 4 keys in case its owner gets fired or leaks it.

How can they achieve this using common padlocks and iron moving parts?

And this is the mechanism. Can you guess how it works?

Hint: the iron disc carrying the locks can rotate, and the handle on the right can be lifted up.

@codewiz This is mine 馃 The first iron pin must be inserted into one of the holes of the padlocks, otherwise the lever does not rise completely, and the gate remains locked.

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