7 machines and complete plants for the manufacture of building materials, namely, porous artificial stone and elements of aerated concrete, lightweight concrete, and foam concrete, namely, raw material handling and mixing apparatus, cutting machines with cutting wires, tilting cranes, autoclaves, separating machines, unloading equipment, and replacement parts and fittings therefore; machines for the manufacture of building elements, namely, steel wire stretching, cutting, and welding machines, anti-corrosion installations, fixing devices, dry cutting machines, and replacement parts and fittings therefore