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Individual
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Individual
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Priority to ES0010547UpriorityCriticalpatent/ES10547U/en
Publication of ES10547UpublicationCriticalpatent/ES10547U/en
A letter-envelope characterized by the fact of being formed by a sheet of paper, whose back sheet presents on its upper edge and in the middle of its vertical edge a folding flap that is applied and fixed by an adherent material that is provided, against the back face of the lower half of the sheet itself when it closes or bends in its transverse half part. (Machine-translation by Google Translate, not legally binding)
ES0010547U1944-09-091944-09-09A letter-on (Machine-translation by Google Translate, not legally binding)
PendingES10547U
(en)