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Priority to ES1970155604UpriorityCriticalpatent/ES155604Y/en
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Publication of ES155604YpublicationCriticalpatent/ES155604Y/en
Improved tractor device, essentially characterized in that it is constituted by two cables joined together by a helical expansion spring, by means of respective forks that passing through the spring are hooked by their branches to the ends of the latter, whose cables are directly connected to the vertices of said forks. (Machine-translation by Google Translate, not legally binding)