Ọ siri ike dị ka hel nwere sistemu freekpụrụ ejiri igwe dị elu mee, fibreglass, zinc alloy, na aluminium, nke nwere ike iguzogide na ịgbachitere ọbụlagodi Akwụkwọ Nsọ nke oke mmiri ozuzo.Na mgbakwunye, ọ meghere akpaaka, yabụ na n'agbanyeghị oke ibu gị nwere, ị…
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