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经营范围
发明名称
SEAL ASSEMBLY FOR A WELL PACKER
摘要
申请公布号
GB2018860(B)
申请公布日期
1982.07.28
申请号
GB19790011177
申请日期
1979.03.30
申请人
DRESSER INDUSTRIES INC
发明人
分类号
E21B33/129;(IPC1-7):E21B33/12
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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