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A locksmith does not have to have previous manipulation experience to use this manual. The theory with this manual is that you with the directions given in this manual for any specific model of safe will find you the last number of the combination. The Manual then gives you the first two numbers of that combination.
With this manual Elmer has opened many Sentry's in less then 60 seconds. He has opened Sentry safes 2 states away by telephone by having the person dialing it on the other end. Once this book is read anyone can do the same thing.