| Notes : |
(1) Corrugated culvert pipe fabricated from special metal sheets which are coated with a layer of asbestos fibres applied in sheet form by pressing into a molten metallic bonding medium, which, when solidified, results in the asbestos fibres being thoroughly saturated with a bituminous saturant, two coatings of special asphalt are finally added by means of immersion.
Les dates de début et de fin de disponibilité sont en fait les dates de demande de production et d'inactivation de la marque de commerce. |