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发明名称
摘要
申请公布号
JPS6115233(B2)
申请公布日期
1986.04.23
申请号
JP19780105032
申请日期
1978.08.30
申请人
MAC GREGOR INTERNATIONAL SA
发明人
PAITAA BAN DE UIIKEN
分类号
E21B15/02;B66F1/02;E02B17/00;E02B17/08
主分类号
E21B15/02
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代理人
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