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Mezzanine and conveyor metal support structures and metal stiffener brackets for assembly thereof, namely, an interlocking metal system of rectangular hollow members and joint stiffening brackets for mezzanine and conveyor supports that are assembled without the need for welding, and a mezzanine and conveyor metal assembly with such a metal support structure

Unit handling conveyors for handling diverse types of materials and replacement structural and structural parts therefor; conveyor belts, chains for conveyors and roller conveyors for handling diverse types of material