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发明名称
Oil well packing device
摘要
申请公布号
US1812358(A)
申请公布日期
1931.06.30
申请号
US19300434315
申请日期
1930.03.08
申请人
MINOR BURT S
发明人
MINOR BURT S.
分类号
E21B33/00;E21B33/04;E21B33/06
主分类号
E21B33/00
代理机构
代理人
主权项
地址
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