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Thermally crystallizable glass on the basis of sio deep 2 - nb deep 2 o deep 5 - alkali metal oxides, made from transparent glass ceramic with the refractive indices of 1,90 to 2,07
Thermally crystallizable glass on the basis of sio deep 2 - nb deep 2 o deep 5 - alkali metal oxides, made from transparent glass ceramic with the refractive indices of 1,90 to 2,07
