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经营范围
发明名称
A preventing method for the changing color of the boat supporter of the semiconductor heat furnace
摘要
申请公布号
KR1019970004830(B1)
申请公布日期
1997.04.04
申请号
KR1019930012451
申请日期
1993.07.02
申请人
发明人
分类号
主分类号
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代理人
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