Last Updated:2025/11/29

Before lowering the bit, the driller inspected the temper screw to make sure the jar would feed and turn slightly on each stroke.

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Before lowering the bit, the driller inspected the temper screw to make sure the jar would feed and turn slightly on each stroke.

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ビットを下ろす前に、掘削作業員はロープ式掘削装置のロープが取り付けられ、各ストロークでドリルジャーを送りながらわずかに回転させるねじ状の連結部を点検した。

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