A block for double-calico constructions (Machine-translation by Google Translate, not legally binding)

摘要

A block for double-walled constructions, essentially characterized by the fact of having two parallel walls, corresponding to two opposite faces of the block, mutually joined by spaced portions that are separated from each other by bays going from one to another of such walls and are established from One piece with them by molding. (Machine-translation by Google Translate, not legally binding)