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Individual
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Individual
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Priority to ES10687ApriorityCriticalpatent/ES10687A1/es
Publication of ES10687A1publicationCriticalpatent/ES10687A1/es
Procedimiento para asegurar el secreto de las cartas encerradas dentro de sobres de papel por la aplicación de abrazaderas metálicas en los cantos exteriores de los sobres de papel.