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Individual
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Priority to ES85576UpriorityCriticalpatent/ES85576Y/en
Publication of ES85576UpublicationCriticalpatent/ES85576U/en
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Publication of ES85576YpublicationCriticalpatent/ES85576Y/en
Improved lens that is characterized essentially by the fact of being constituted by a sheet of transparent material and provided on at least one of its faces with a plurality of circularly arranged, concentric ribs, which have two flanks, one smooth and perpendicular to the other. plane of the blade and the other convex. (Machine-translation by Google Translate, not legally binding)