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发明名称
摘要
申请公布号
JPS6329983(Y2)
申请公布日期
1988.08.11
申请号
JP19840163855U
申请日期
1984.10.31
申请人
发明人
分类号
F16L3/20;E21B7/00;E21B7/02;F16L3/18;F16L3/215;(IPC1-7):F16L3/18
主分类号
F16L3/20
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代理人
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