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Priority to ES1971174733UpriorityCriticalpatent/ES174733Y/en
Publication of ES174733UpublicationCriticalpatent/ES174733U/en
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Publication of ES174733YpublicationCriticalpatent/ES174733Y/en
Rule of double flown profile, characterized by comprising the arrangement of a flat and elongated surface that for each one of its faces and diametrically opposed, has been made a recess or beveled with a somewhat oblique section, equipped with a metric scale and luck that when placed in an inverted position, the beveled area is blown away from the rest of the surface of the ruler, thus ensuring that the traced line is not blurred. (Machine-translation by Google Translate, not legally binding)