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Publication of ES258895A3publicationCriticalpatent/ES258895A3/en
Method for the manufacture of envelope-letters for correspondence characterized by a sheet of appropriate or folio size which is boxed in such a way that it is susceptible of a vertical fold in its mitady of two vertical folds to the already mentioned one with the particularity that the resulting spaces must be about the same (Machine-translation by Google Translate, not legally binding)
ES0258895AMethod for manufacturing over-letters for correspondence (Machine-translation by Google Translate, not legally binding)
ExpiredES258895A3
(en)