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发明名称
摘要
申请公布号
JPS635548(B2)
申请公布日期
1988.02.04
申请号
JP19830046843
申请日期
1983.03.18
申请人
TONE BORING CO
发明人
SATO TOSHIHIKO
分类号
E21B10/50;E21B10/46
主分类号
E21B10/50
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代理人
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