发明名称 |
Twist-off preventer |
摘要 |
|
申请公布号 |
US1759337(A) |
申请公布日期 |
1930.05.20 |
申请号 |
US19280284507 |
申请日期 |
1928.06.11 |
申请人 |
ZUBLIN JOHN A |
发明人 |
ZUBLIN JOHN A. |
分类号 |
E21B17/06 |
主分类号 |
E21B17/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|
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