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The main benefit of a master key is that you can add new locks to your residence or small business while not having to put more keys on your key ring.
Master keys are a unique concept somewhat like lock picking since it's a means of getting past locks without the main key.
This lets one individual, say a building manager or super, gain access to many different locks, while every individual owner can open only their particular lock without having to be able to open every one of the locks |