U.S. federal trademark · Serial No. 79011846 · Reg. No. 3162840
Non-metal structural elements and units for public and private engineering comprising conduits made with prefabricated elements placed side by side, structures comprising tunnels and underpasses, covered shelter structures, prefabricated elements in the nature of concrete blocks, concrete pavements, concrete sheets, concrete walls for making the above structures, non-metal support elements for the above structures
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