发明名称 |
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摘要 |
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申请公布号 |
JPH03503664(A) |
申请公布日期 |
1991.08.15 |
申请号 |
JP19890502007 |
申请日期 |
1989.01.24 |
申请人 |
|
发明人 |
|
分类号 |
E21B23/03 |
主分类号 |
E21B23/03 |
代理机构 |
|
代理人 |
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主权项 |
|
地址 |
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