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发明名称
ROCK BIT
摘要
申请公布号
JPS58222289(A)
申请公布日期
1983.12.23
申请号
JP19820105014
申请日期
1982.06.18
申请人
MITSUBISHI KINZOKU KK
发明人
HIWASA YONEO;NAKAYAMA TOSHIAKI
分类号
E21B10/52;E21B10/56
主分类号
E21B10/52
代理机构
代理人
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地址
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