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Publication of ES258897A3publicationCriticalpatent/ES258897A3/en
Method for the manufacture of letter envelopes for correspondence characterized by a sheet of folio size or appropriate box in such a way that it is susceptible of a vertical fold in its mitady of two horizontal folds in relation to the one indicated above, which must be done in such a way that the spaces resulting in a number of six or more are approximately equal in size. (Machine-translation by Google Translate, not legally binding)
ES0258897AMethod for manufacturing over-letters for correspondence (Machine-translation by Google Translate, not legally binding)
ExpiredES258897A3
(en)