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Lesson 17 How to Master Key a Lock.
In this lesson you will learn about master keying locks. 

When someone says a lock has a master key it really means that there is more than one key that can operate the lock.  This is primarily done for businesses and apartment complexes.  Setting up master key system is fairly easy and can be very profitable.  

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If you are comfortable whit the material above then it is time to move on to the next lesson. Click here to go to the next lesson.