(under subclass 163) Device comprising two or more closures each mounted for movement irrespective of any movement of the other but which can be connected together for movement as a unit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
142+, for a plurality of closures in which the type of movement of each closure is different from and independent of the other.
164+, for a plurality of independently sliding closures which swing together on a pivoted frame.