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经营范围
发明名称
STRATA MOVEMENT INDICATOR
摘要
申请公布号
GB9105296(D0)
申请公布日期
1991.04.24
申请号
GB19910005296
申请日期
1991.03.13
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
分类号
E21B47/00;E21F17/18;G01B5/30
主分类号
E21B47/00
代理机构
代理人
主权项
地址
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