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Priority to ES0036790UpriorityCriticalpatent/ES36790Y/en
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Publication of ES36790YpublicationCriticalpatent/ES36790Y/en
An improved backpack, characterized by being equipped with a support frame, consisting of several steel strips arranged in a triangle or in another convenient form, on the back of the backpack and having some pieces of tape that link at the ends of they, acting as bowstrings, as a function of adjustable tensors to the determined curvature. (Machine-translation by Google Translate, not legally binding)