"Device for the construction of bases" of the type composed of two elements, concrete slabs (1) and slab union elements formed by two plates, one lower (2) and another upper (3), characterised essentially because the lower plate (2) has at least two perforations both with threads suitable to receive a bolt or stud for their fixing to the upper plate (3), which is formed by two parts united by a dovetail joint, each with a perforation to match those of the lower plate (2).
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