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发明名称
EARTH BORING BIT
摘要
申请公布号
JPS57193691(A)
申请公布日期
1982.11.29
申请号
JP19820079821
申请日期
1982.05.11
申请人
HUGHES TOOL CO
发明人
ANTON EFU ZAARADONIKU
分类号
E21B10/22;E21B10/25;F16J15/32
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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