Afọ nke nguzobe 1991. Mbubata nke ihe eji ewu ụlọ na usoro: el. Igwe ọkụ ọkụ RAYCHEM na kpo oku, ọkụ anyanwụ, sistemu mmiri ọkụ anyanwụ, ndị na-anakọta ikuku na-ekpo ọkụ, mkpuchi mkpuchi asphalt +, eriri, shingles, roba mmiri mmiri, paving, nano polymers, teepu mgbasawanye, ọnụ ụzọ ọkụ ...