The new and practical drop-proof device plays the function of ensuring safety of the scaffold in the course of lifting up and down.
实用新型的防下坠装置在架体升降过程中起到保证安全的作用。
The combined screw has the advantages of the easy processing, the convenient use and the good drop-proof and loose-proof effects.
该组合螺丝具有易于加工、使用方便、防脱落松动效果好的特点。
The combined screw has the advantages of the easy processing, the convenient use and the good drop-proof and loose-proof effects.
该组合螺丝具有易于加工、使用方便、防脱落松动效果好的特点。
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