(under subclass 13) Device wherein the signalling means is located at a place removed from the closure to indicate its position to a nonuser of the passage closed.
SEE OR SEARCH CLASS
340, Communications: Electrical,
517+, for electrical indicating systems responsive to a plurality of sensed conditions; subclasses 524+ for same with position of the condition indicator; subclasses 531+ for electrical condition responsive system where the sensed condition is at a remote location and there is a particular coupling link; and subclasses 545.1+ for electrical condition responsive indicating systems automatically responsive to door or window movement.
