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Application filed by Wilhelm BlankfiledCriticalWilhelm Blank
Publication of BE573468ApublicationCriticalpatent/BE573468A/en
Priority to ES0277785ApriorityCriticalpatent/ES277785A3/en
A system for manufacturing an element of structure used as a beam or as an alargable support by telescope and without stairs (Machine-translation by Google Translate, not legally binding)