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发明名称
Floating supporter for drill pipe
摘要
申请公布号
US1764488(A)
申请公布日期
1930.06.17
申请号
US19290357009
申请日期
1929.04.22
申请人
ZUBLIN JOHN A
发明人
ZUBLIN JOHN A.
分类号
E21B17/00;E21B17/10;E21B44/00
主分类号
E21B17/00
代理机构
代理人
主权项
地址
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