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Nov 28, 2008 
The definition from the locksmith dictionary says;
a lock for a door prepared with one or more
cross-bores and one or more edge-bores.
A cross bore is a hole bored or drilled into the face of the door.
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captive key, cylindrical lock, deadbolt, KIK, KIL, leverset, tubular lock
Nov 28, 2008 The Locksmith Dictionary defines a rim lock as;
a lock or latch typically mounted on the surface of a door or drawer.
Nov 28, 2008 From the Locksmith Dictionary;
a lockset, the case of which is designed to fit in a mortise in the edge of a door or drawer.
A mortise is basically a one ended hole that isn’t round. Current day mortise locks have a design that goes back to the 1878 patent for the pin tumbler mortise cylinder. Mortise locks are expensive and expensive to install because they require special equipment and more time.