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BR9303508A
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Apparatus for obtaining annular cavities at the bottom of perforations made on surfaces of any type
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BR8700373A
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Apparatus for obtaining annular cavities in the back of drills made in surfaces of any types
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EP0226524A1
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Improvements introduced in the anchoring systems by threaded bolts
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ES8702198A1
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Apparatus for obtaining annular cavities in the background of drills practiced on paraments of any kind
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ES479883A1
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Milling apparatus for widening drill-holes and perforations
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ES474022A1
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Anchorage system of the elements to be supported on the completed structure
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