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Priority to JP1976139941UpriorityCriticalpatent/JPS5716500Y2/ja
Publication of JPS5358077UpublicationCriticalpatent/JPS5358077U/ja
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Publication of JPS5716500Y2publicationCriticalpatent/JPS5716500Y2/ja
Procede de fabrication par tri-extrusion d'un crayon a ecrire ou a colorier et crayon a ecrire ou a colorier comportant une couche intermediaire de protection