Patent AT-E39969-T1: [Translated] BOREHOLE DRILLING DEVICE.
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A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a...
一类钻井组件（well drilling assembly），其特征为将旋转装置（rotary device）连接至钻井绞车（drawworks），例如安装于井架（derrick）上的提升吊钩（hoisting hook）处，该旋转装置……
