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Photo leading glass, suitable as near portion material for the fusion with phototropic far some glasses, on the basis of an optical glass of the system sio deep 2 - b deep 2 o deep 3 - al deep 2 o deep 3 - la deep 2 o deep 3 - (zno)
Photo leading glass, suitable as near portion material for the fusion with phototropic far some glasses, on the basis of an optical glass of the system sio deep 2 - b deep 2 o deep 3 - al deep 2 o deep 3 - la deep 2 o deep 3 - (zno)
