| http://www.w3.org/ns/prov#value | - ering media, or a glass cloth filter, or the like; or a combination of degassing treatment with filtering treatment. [0216] It is preferable that purification treatment as aforementioned be performed to prevent defects caused by foreign matter such as non-metal inclusion in the molten metal and oxides, and defects caused by gasses dissolved in the molten metal.
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