(under subclass 230.1) Device in which the supplemental back includes a rigid skeletal structure and an occupant-engaging surface made of a flaccid material mounted across the rigid skeletal structure, wherein the occupant-engaging surface may be in the form of a panel or a plurality of elongated webs.
SEE OR SEARCH THIS CLASS, SUBCLASS:
452.63, for a bottom or back support surface comprised of individual elongated elements.