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Publication of ES336272A1publicationCriticalpatent/ES336272A1/en
Improvements in the ring books, characterized in that the two covers each consist of two layers of plastic sheets, one layer being configured as an outer sheet that extends over the width of the open ring book and at the same time forms the spine ring book and on the inside of which the second layers located in the area of the covers are welded outside the area of the flexible spine. (Machine-translation by Google Translate, not legally binding)
ES0336272A1966-01-311967-01-31Improvements in the books of rings. (Machine-translation by Google Translate, not legally binding)
ExpiredES336272A1
(en)