the element of the meeting in question consists of a basic element (1) to form 4-sided with side more (2a) that extend.at its extremities and over the smaller sides (2b), with their respective wings (7) forming a pair of second side trays (8), bystanders, conformed to "u" and open laterally, suppliesin correspondence of their free ends.a bridge (9) of the transverse union lower height so as to create a pair of bilateral fora in order to define a line of closure elements and vertical inhorizontal (fig. 1).
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