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Priority to ES0046797UpriorityCriticalpatent/ES46797Y/en
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Publication of ES46797YpublicationCriticalpatent/ES46797Y/en
New screw, which is characterized by two helical protrusions or reciprocally reciprocating propellers on its cylindrical body, provided that the separation in the turns or passage, as well as the height in the shoulder, is the same for the two helices . (Machine-translation by Google Translate, not legally binding)