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Publication of FI83686BpublicationCriticalpatent/FI83686B/fi
Publication of FI83686CpublicationCriticalpatent/FI83686C/fi
Element prefabrique en beton tel qu'un voussoir de tunnel, joint d'etancheite pour cet element, et procede et moule de fabrication de cet element.
Procede et dispositif pour le moulage de pieces creuses en beton comportant des trous garnis de joints d'etancheite pour le raccordement de tuyaux.