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 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 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。
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