A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
游丝在手表或钟内用于调整计时器摇轮运动的细小的卷绕弹簧
A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
游丝在手表或钟内用于调整计时器摇轮运动的细小的卷绕弹簧