Rotating square with coupling opening for the assembly of shelves ", characterized by story are constituted by a sheet metal angle, whose two branches are one longer than another, in the longest that will have a horizontal position and at its rounded end it has a hole, and in the shortest that is vertical will be practiced an acute angle looking down, rounded by its ends and vertex, and to give greater strength can be double, in which case the branch or horizontal side will be longer and vertical will go equipped with two angled openings instead of one. (Machine-translation by Google Translate, not legally binding)
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