(under the class definition) Device comprising a main closure for an opening and an additional supplementary closure which overlies the main closure in a back-to-back relationship in their operative closed position, one of which closures is movable or removable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50+, for a grille, face to face with a closure, or a guard occupying a passage vacated by the closure and adapted to prevent unlawful entry or unintentional travel through the passage.
68, for a plurality of closures spaced at intervals along a course of travel.
125+, for plural closures for a single opening which move to an inoperative position overlying one another in back-to-back relationship.
SEE OR SEARCH CLASS
52, Static Structures (e.g., Buildings), 202+, for an auxiliary shield attached to a main panel, barrier, or frame.
160, Flexible or Portable Closure, Partition, or Panel,
90+, for facially opposed primary and screened auxiliary closures.
