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Priority to ES1978236076UpriorityCriticalpatent/ES236076Y/en
Publication of ES236076UpublicationCriticalpatent/ES236076U/en
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Publication of ES236076YpublicationCriticalpatent/ES236076Y/en
Curled to be constituted by a corrugated base plate, preferably of double layer polyester, which has a wide rectangular window, which affects most of its extension, and in whose mouth a perimetric flap is established, whose free edge is glued in a closing lid also provided with a perimetric flap, with the particularity that said lid is hinged by one of its end areas to the envelope flap of the window, while by its opposite extreme zone it is related through two pairs of connecting rods with its own, base plate, having been provided at the mouth of the same and in correspondence with the aforementioned cranks, the arrangement of a transverse axis that is constituted in drive means for the same, to which end a reducer is associated thereto. Electric manual. (Machine-translation by Google Translate, not legally binding)