(under subclass 633) Structure having means for allowing movement of the elongated members forming the openwork so as to merely adjust one member with respect to the other or to allow movement for collapse without disconnecting them.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111+, for a mechanically operated, extensible or relatively movable mast assembly.
632, for a shaft or openwork construction which is axially extensible without disassembly or collapsibility.
641, for a collapsible or demountable peaked or curved truss.