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发明名称
摘要
申请公布号
JPS557516(B2)
申请公布日期
1980.02.26
申请号
JP19720083383
申请日期
1972.08.22
申请人
发明人
分类号
E21B7/132;E21B7/124;E21B7/128;E21B17/01;(IPC1-7):E21B7/13
主分类号
E21B7/132
代理机构
代理人
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