(under subclass 431) Devices which provide for immediate release of the lock operating mechanism or its movement to unlocked condition by special access to the lock operating mechanism through provisions not known by the public or usually inaccessible to the public, or incorporating
non-public yieldable or frangible connections or supports for release in an emergency.
SEE OR SEARCH THIS CLASS, SUBCLASS:
274, for emergency releasing mechanisms specifically designed for association with clockwork control for lock operating mechanism.
340+, for emergency releasing arrangements providing for access through the usual implement guideway or receptor.
394, for implements providing for authorized ready release of a key operating mechanism in the event of loss or inaccessibilty of the proper key.
