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发明名称
摘要
申请公布号
JPS6050282(U)
申请公布日期
1985.04.09
申请号
JP19830140180U
申请日期
1983.09.12
申请人
发明人
分类号
E21B4/02;(IPC1-7):E21B4/02
主分类号
E21B4/02
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