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发明名称
Borehole drill pipe continuous side entry or exit apparatus and method
摘要
申请公布号
USRE33150(E1)
申请公布日期
1990.01.23
申请号
US07/381027
申请日期
1989.07.17
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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