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Dispositivo para la sujeción de tornillos de fijación en la mampostería caracterizado por un casquillo de broca introducido en la mampostería golpeando y girándolo simultáneamente cuyo casquillo está dotado de una entalladura longitudinal y además por una pieza de apriete que es introducida en el casquillo de broca y dilatada por el tornillo de fijación.
ES103619U1964-01-161964-01-16Dispositivo para la sujeción de tornillos de fijación en la manpostería
ExpiredES103619Y
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