(under subclass 506) Structure in which one section including plural facers and a dissimilar in situ erected section together form unoccupied enclosed spaces in a wall, ceiling or floor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
302.1+, for a construction having a drain or vent which opens to the ambient and see the search notes for other constructions having passages or hollows, particularly 479+ for face-to-face barrier sections spaced by a prepositioned frame or shaft and 503+ for abutted modules of channel or tubular cross-sections which form a barrier with through flow passages.
511, for a panel with mounting means thereon attached to another panel which may form a cavity, e.g., upholstered automobile doors.
