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发明名称
摘要
申请公布号
JPS6257794(B2)
申请公布日期
1987.12.02
申请号
JP19820134628
申请日期
1982.07.30
申请人
HUGHES TOOL CO
发明人
EDOWAADO JEI MAKUFUADEN
分类号
E21B19/06;E21B19/07
主分类号
E21B19/06
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