黑漆单弹簧铰链
single action black japanned spring hinge
单双弹簧铰链
single & double action spring hinge
黑漆弹簧铰链
black japanned spring hinge
黑漆纱门弹簧铰链
black japanned screen door spring hinge
黑漆双弹簧铰链
double-action black japanned spring hinge
单向平衡传输
unilateral balanced transmission
弹簧平衡安全阀
spring balance safety valve
埋头平头钻头
countersunk flat head bit
平衡器弹簧铰接销
equalizer spring pivot pin
全铰链平面连杆机构
planar linkage with all joint