Umzi-mveliso wethu

Oko kumalunga ne-5350 yeemitha zesikwele somzi-mveliso wethu, kwaye kukho iileyile ezi-6 kumzi-mveliso wethu, kwaye ngaphezulu kwe-10 yabasebenzi beeleyile babasebenzi kwaye bangaphezulu kwe-7 abashicileli kunye nabahlanganisayo, kulo mzi-mveliso kukho ngaphezulu kwe-100 imigca yemveliso ye-extrusion eveliswa minyaka le, oomatshini bathunyelwa kumazwe angaphezu kwama-60 ehlabathi, njengeMelika iJamani, iPakistan, iKazakhstan, iVietnam, iIndiya, njl.