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People

Authority having jurisdiction
the person, usually within a municipality, charged with the application and interpretation of local life safety codes.
Barren, Robert
the Englishman credited with the invention of the double-acting lever tumbler in 1778
Bramah, Joseph
the Englishman who had the world's first patent of a locking mechanism in 1784. It was the first lock incorporating a cylinder whose key did not contact the lock bolt directly.
Locksmith
a person with the knowledge and ability to select, install, service and bypass all the components of an electrical or mechanical lock.
Personal identification number
a series or numbers and/or letters associated with a particular individual as a means of identification.