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发明名称
RINGROM-SIKKERHETSVENTIL.
摘要
申请公布号
NO903764(D0)
申请公布日期
1990.08.28
申请号
NO19900003764
申请日期
1990.08.28
申请人
BRITISH PETROLEUM COMPANY PLC, THE
发明人
HOPPER, HANS PAUL
分类号
E21B33/129;E21B34/06;E21B34/10;(IPC1-7):E21B/
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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