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经营范围
发明名称
Coalbed drilling
摘要
申请公布号
GB9502968(D0)
申请公布日期
1995.04.05
申请号
GB19950002968
申请日期
1995.02.15
申请人
CONOCO INC
发明人
分类号
E21B7/00;E21B7/04;E21B21/14;E21B21/16;E21B43/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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