The utility model relates to a square complement core for a well drilling process, which belongs to an appliance of a well drilling device.
本实用新型是一种在钻井过程中使用的方补芯，属钻井设备的器具。
The utility model relates to a square complement core for a well drilling process, which belongs to an appliance of a well drilling device.
本实用新型是一种在钻井过程中使用的方补芯，属钻井设备的器具。
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