n. scala
misc. ladder shell
电梯螺丝 ELEVATOR BOLTS
梯形螺纹 acme thread form ; trapezoid thread ; trapezoidal screw thread ; Metric trapezoidal screw threads
阶梯螺纹 stepped screw
电梯螺栓 Elevator bolts
旋梯螺 Japanese Wonder Shell
电梯螺杆的锻造 Production Technology Elevator Screw Forging
螺旋梯 cockle stairs ; spiral staircase ; spiral stairs ; spiral stairways
梯形螺杆泵 trapezoid screw pump
螺旋爬梯 cockle stairs
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