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发明名称
摘要
申请公布号
JPS5751515(B2)
申请公布日期
1982.11.02
申请号
JP19780002602
申请日期
1978.01.13
申请人
发明人
分类号
E21B43/013;F16L37/00
主分类号
E21B43/013
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