CORUNDUM (MINERALOGY)
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BTOXIDES (MINERALOGY)
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BTVERY HARD MATERIALS
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UDC549.517.1
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Descriptor GERKORUND (MINERALOGIE)
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Descriptor ENGCORUNDUM (MINERALOGY)
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Descriptor FRECORINDON (MINÉRALOGIE)
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NTRUBY (MINERALOGY)
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NTSAPPHIRE (MINERALOGY)
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RTCERAMIC RAW MATERIALS (CERAMICS)