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Mannesmann Demag AG
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Demag AG
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Publication of FR2271752A7publicationCriticalpatent/FR2271752A7/fr
Tete de forage du genre comportant notamment un outil de forage auquel est associe un moteur propre a assurer l'entrainement en rotation de cet outil de forage
Method of placing cable jointing chambers or the like into cavities provided therefor in the ground and jointing chamber for carrying the method into effect