(under subclass 447) Devices usually associated with the exterior of a lock operating mechanism providing guiding means to aid in the ready insertion of the key into the lock operating mechanism at times when the key-hole may not be visible.
SEE OR SEARCH CLASS
250, Radiant Energy,
466.1, for luminous fluorescent or phosphorescent covers, keys, and attachments therefor, and subclasses 483.1+ for fluorescent and phosphorescent devices generally.
