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four-point bit

dril. 四刮刀钻头
eng.geol. 十字形钻头
tech. 四翼钻头; 四刃钎头; 十字钻探钻头; 十字扁铲
four point bit
el. 十字钻探钻头; 十字扁铲
mining. 十字钻头
oil 十字形钻头

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