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An arrow lock is a lock with standard dimensions used by the United States Postal Service for mail carriers to access collection boxes, outdoor parcel lockers, cluster box units, and apartment mailbox panels. Arrow locks are unlocked through the use of a corresponding arrow key. Arrow locks are also referred to as "Master Access Locks" [1]
Lock designs became significantly more complicated in the 18th century, and locksmiths often specialized in repairing or designing locks. Although fitting of keys to replace lost keys to automobiles and homes, and the changing of keys for homes and businesses to maintain security is still an important part of locksmithing, according to a 1976 ...
Locks are usually re keyed to build master-key systems, make a set of locks share a common key, or to eliminate compromised keys. [2] [3] [4] Sometimes worn pins are replaced with new pins if the old pins become too short to reach the shear-line. [5] The shear-line is the thin line shared by the lock plug and its cylindrical housing. If a pin ...
Locks that have master keys have a second set of the mechanism used to operate them that is identical to all of the others in the set of locks. For example, master keyed pin tumbler locks often have two shear points at each pin position, one for the change key and one for the master key. A far more secure (and more expensive) system has two ...
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