(under subclass 416) Devices opposing attack concentrated upon a portion of the locking mechanism not specifically designed to accomplish normal operation of the lock operating mechanism.
SEE OR SEARCH THIS CLASS, SUBCLASS:
151, for devices associated with locking latch-bolts which dog the latch-bolt in projected position.
SEE OR SEARCH CLASS
292, Closure Fasteners,
346, for devices preventing knife blade insertions at the latch and keeper engaging locality to prevent forcing back of a bolt into its housing.
