A study of the rod type manual operated vacuum switch (RMVS) is introduced.

介绍了杆式手操作真空负荷开关的研究。

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Model QW50A Air Operated Slips is a wellhead tools. Mainly used to clipping tubing and drilling rod which raise or put down at well repairing service operation.

QW50A气动卡瓦是油田修井作业时，安装在井口上用于卡紧油管及类似管柱的一种工具。

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The equipment has high production efficiency, concrete bars need no aligning, and coil rod may be operated directly.

该设备生产效率高，钢筋无须绞直，盘条直接上机；

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As the head of the company, Hayward became a lightning rod for public and political anger after the drill rig operated by BP exploded in the Gulf of Mexico in April.

CNN: BP's Hayward: Oil spill wasn't because of cost-cutting