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General Ganadera S A(ganal)
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General Ganadera S A(ganal)
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Priority to ES1977231694UpriorityCriticalpatent/ES231694Y/es
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Publication of ES231694YpublicationCriticalpatent/ES231694Y/es
Una cubierta perfeccionada para formación de tuneles, caracterizada esencialmente por el hecho de estar constituida por una chapa exterior envolvente lámina flexible de material plástico interior, entre las cuales queda situado un material do relleno aislante sal como fibra de vidrio.
ES1977231694U1977-10-281977-10-28Una cubierta perfeccionada para la formacion de tuberias.
ExpiredES231694Y
(es)