Abstract: Support structures, systems, and methods are disclosed. Among the support structures are pallets designed especially, although not necessarily exclusively, for cold-weather environments such as commercial refrigerators and freezers and refrigerated transport carriers. Such pallets may include non-skid materials and optionally are recyclable, have improved stacking and load-bearing attributes, and incorporate recycled materials.

Abstract: A clean box in which the rubber arms and hands may slide laterally relative to the remainder of the box. A first rigid plastic sheet has ovals passing through it. A second rigid plastic sheet, in front of the first, has circular openings on which the rubberized arm and hand gloves attach. The circular openings' diameter approximately equals the smaller dimension of the ovals on the first sheet of plastic. Resin strips provide an air seal along the upper and lower edges of the sliding first sheet of plastic. Wiper blades attached to the edges of the moving sheet complete the seal between the two sheets of plastic. A worker, with his hands and arms in the gloves and needing to reach a distant point in the clean box, may simply push against the edge of the openings for the gloves. The sheet of plastic will then move in the direction in which pushed. The clean box may have entirely rigid transparent sides to allow for a clear view.

Abstract: The invention provides a seat comprised of spaced rectangular frame members formed of tubular plastic, the frame members being held together by at least three tubular cross members which join to the frame members by means of mechanical pressure fitting. Around the cross member is provided a webbing in a triangular-fashion. The seat has two positions, or seating modes, effected by a rotation of 90.degree..The mechanical pressure fittings comprise an expansible shaft having an outside diameter substantially the same as a tube into which it resides. The shaft is expanded by rotating a bolt which associates the shaft with an expansion wedge. The fitting further connects to a second tube transverse to the first, through the means of the same bolt and while avoiding compression of the second tube by way of an internal spacer element.