In our experience as professional locksmith service providers, we have discovered that people have many different questions related to locks and keys. Here you will find the answers to some of the most commonly asked ones. Read them carefully and benefit from them now and in the longer term.
The master lock is a system of multiple locks, which open by two keys. One key belongs to the tenant of each apartment for example and the other key is kept by the superintendent. The tenant's key opens only his house; the superintendent's key is the master key and opens the apartments of all tenants.
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