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发明名称
TRANSDUCER SYSTEM
摘要
申请公布号
GB8815618(D0)
申请公布日期
1988.08.03
申请号
GB19880015618
申请日期
1988.06.30
申请人
COAL INDUSTRY (PATENTS) LTD
发明人
分类号
E21B47/04;E21B47/09;G01P3/66
主分类号
E21B47/04
代理机构
代理人
主权项
地址
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