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A control key is a key used in interchangéable core locking systems.  The control key enables the user to remove a core in the cylinder, with a specific combination and replace it with a core with a different combination.  In small format interchangéable cores, similar to those developed by Frank Best of the Best Lock Corporation, the key operates a separate shéar line, located above the operating key shéar line.  In other format interchangéable cores, the key may work like a master key along the operating shéar line and also contact a separate locking pin that holds the core in the cylinder.