Umwaka wo gushinga 1991. Kuzana ibikoresho byubaka na sisitemu: el. RAYCHEM gushyushya no gushyushya insinga, amashanyarazi akomoka ku mirasire y'izuba, sisitemu yo gushyushya amazi y'izuba, gukusanya ikirere gishyushye, gutwikira amabati ya asfalt, umukandara, shitingi, reberi y'amazi, pave, nano polymers, kaseti yo kwagura, inzugi z'umuriro ...