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Ibara ry'umukara
Ubukonje buzengurutse ibishishwa byirabura (CRBA), bizwi kandi nka "Icyuma cyubururu".CRBA ni aubukonje buzungurukaibyo byashizwemo na annealing mugushiraho bidasanzwe kugirango habeho urwego ruto cyane rwa magnetite (Fe304) hejuru (munsi yuburebure bwa 1 mm) kugirango urinde byinshi.