(under subclass 320) Structure including fillers which are subdivided into two or more sections, which sections cooperate with each other to form a complete filler unit, which unit forms a void within the cast in situ material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
380+, for cast in situ barrier construction defining an isolated space and lacking a laterally projecting rib-type sustainer.
576, for a module with an isolated internal cavity.
