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经营范围
发明名称
WELL LATCH
摘要
申请公布号
GB1588554(A)
申请公布日期
1981.04.23
申请号
GB19780012286
申请日期
1978.03.29
申请人
OTIS ENG CORP
发明人
分类号
E21B23/02;E21B23/06;E21B33/129;(IPC1-7):E21B23/02
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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