③An stuth ceirmeag bulletproof as cumanta Bhon 21mh linn, tha ceirmeag bulletproof air a thighinn air adhart gu luath, agus tha iomadh seòrsa ann, nam measg alumina, silicon carbide, boron carbide, sileacon nitride, titanium boride, msaa, am measg sin ceirmeag alumina (Al₂O₃), silicon carbide cera...
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