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发明名称
SWIVEL JOINT FOR DRILLING HARD ROCK
摘要
申请公布号
JPS55148889(A)
申请公布日期
1980.11.19
申请号
JP19790055299
申请日期
1979.05.08
申请人
HITACHI CONSTRUCTION MACHINERY
发明人
KUSUMI HIROSHI
分类号
E21B17/05
主分类号
E21B17/05
代理机构
代理人
主权项
地址
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