Safety valve on the structure forms can be divided into spring - loaded, lever - type weights, the pilot - style .
安全阀按结构形式可分为弹簧 式 、 杠杆重锤式 、 先导 式.
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It features dialed stitch regulator , lever - type forward - backward sewing mechanism automatic lubrication, neat and beauty stitches.
线迹平整美观, 高低速缝机 、 倒顺缝针距误差小.
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