| 发明名称 |
Power tong |
| 摘要 |
An open head power tong for use in making-up and breaking-out joints of varying diameter such as drill pipe joints which provides for bi-directional operation with the tong housing remaining in the same position.
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| 申请公布号 |
US4060014(A) |
申请公布日期 |
1977.11.29 |
| 申请号 |
US19760681654 |
申请日期 |
1976.04.29 |
| 申请人 |
JOY MANUFACTURING COMPANY |
发明人 |
TURNER, JR., JOHN W. |
| 分类号 |
E21B3/04;E21B19/16;(IPC1-7):B25B17/00 |
主分类号 |
E21B3/04 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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