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发明名称
METHOD FOR PREVENTING WATER FROM FREEZING IN GAS BOILER
摘要
申请公布号
KR1019930001848(B1)
申请公布日期
1993.03.15
申请号
KR1019900016143
申请日期
1990.10.11
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
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