BWM ibiziga
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ibiziga byabagenzi aluminium 4-6 ibyobo byahimbwe ibimodoka byimodoka ibizunguruka
Uruziga ni igice kimeze nka barriel, imbere imbere yipine ishyigikira ipine, naho hagati ni igice cyicyuma gishyizwe kumutwe. Ukurikije ibipimo bitandukanye, ubugari, uburyo bwo kubumba hamwe nibikoresho, hariho ubwoko bwinshi bwibiziga.