Locksmithing is the profession of creating, installing, or maintaining locks, safes, and related mechanical access control technologies, such as doors and alarms. Modern day locksmiths primarily install and service locks, safes, and alarms, and provide lock-out and key duplication services to their community. Locksmiths use various methods of compromise to open and remove locks for customers. Because of the nature of skills used, locksmithing is restricted to licensed or certified individuals in certain states and countries.
http://www.lockwiki.com/index.php/Locksmithing
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