Commercial, Residential Locksmith Whitby, Vaughan, Toronto ON

How does a master key work?

Author: External Author | | Categories: Door Lock Systems , Keypad lock

The super of our apartment building is always going into everyone's apartment when something needs to be fixed. There must be a hundred apartments, but he only carries one key around with him. How does he get into all those apartments with the same key?

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Original Article Source Credits:   How Stuff Works ,

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