A synthetic plastic concrete wall tie comprising a pair of triangular truss sections disposed in end-to-end relation, an intermediate web section joining the truss sections of the apexes of triangles of the triangular truss sections, and T-shaped end sections at opposite ends of the tie with each end...http://www.google.es/patents/US4730422?utm_source=gb-gplus-sharePatente US4730422 - Insulating non-removable type concrete wall forming structure and device and system for attaching wall coverings thereto
Insulating non-removable type concrete wall forming structure and device and ...
