Mu myaka icumi ishize, gutondeka neza ibyuma bikomye hamwe na polycrystalline cubic boron nitride (PCBN) byinjije buhoro buhoro gusya. Tyler Economan, umuyobozi ushinzwe amasoko muri Index, muri Amerika, yagize ati: "Muri rusange, gusya ibishishwa ni inzira ihamye itanga uburinganire buhanitse kurut...

Mu gutunganya, igikoresho cyahoze cyitwa "amenyo yakozwe munganda", kandi gukata imikorere yibikoresho ni kimwe mubintu byingenzi bigena umusaruro wacyo, igiciro cyumusaruro nubwiza bwo gutunganya. Kubwibyo, guhitamo neza ibikoresho byo gukata ni ngombwa, ibyuma bya ceramic, hamwe nubushyuhe bwabyo ...