Igiteranyo 18 cyibikoresho byo gusya bya marike nka Tsugami, Inyenyeri, Mazak, na Muvandimwe.Kwihanganirana bishobora kugera kuri 0.003mm, diameter ntarengwa yakazi ni 600mm, naho uburebure ni 1000m.
Igihe cyo kohereza: Ugushyingo-13-2023