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Una barrena para perforar terrenos para la construcción de pilotes in situ, caracterizadas por el hecho de estar estructurada con un cuerpo helicoidal provisto de una porción superior hueca, unible al tubo vástago, provista interiormente de una válvula de obturación, y de una porción inferior, que forma la punta de ataque, constituida de dos mitades que se complementan articuladas respectivamente por extremos opuestos a la porción superior.
ES1967134473U1967-12-211967-12-21Una barrena para perforar terrenos para la construccion de pilotes in situ.
ExpiredES134473Y
(es)