| http://www.w3.org/ns/prov#value | - In this method, a thin cylindrical layer 11 of a fine powder of pure silica, a thin cylindrical layer 12 of a fine powder of pure silica containing such an oxide as TiO2 and a thin cylindrical layer 13 of a fine powder of pure silica are deposited in turn one upon another on the inner surface of the tube 10 of fused silica.
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