| http://www.w3.org/ns/prov#value | - The negative thermal expansion glass ceramic according to the present invention is milled by the known mills, such as a ball mill, a vibrating mill, a roller mill, or a jet mill to have grain sizes of not more than 100 ??m, preferably not more than 50 ??m, and mixed with the organic substances or inorganic substances used in the respective fields, thereby the coefficients of thermal expansion of t
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