(under the class definition) Device comprising a back including means by which it may be secured to or mounted on a horizontal supporting surface and readily removed therefrom, without employing fixtures mounted on the surface, so as to be removable from association with one surface to association with another surface.
(1) Note. These devices are often called "bleacher seats" and are temporarily attached to board-type seats.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.1+, for a similar device in combination with a primary bottom and back unit, or with means to connect it to a back of seat, i.e., a substitute back rather than an auxiliary back.
250.1+, for a substitute bottom, which may be combined with a back, having means to detachably secure it to a subjacent bottom.
382, for a bottom hinged to a back by a fabric hinge and usable as a supplemental pad to overlie a primary bottom and back unit.
440.15+, for a back interconnected with a bottom by a manipulated joint.
