| 摘要 |
The invention relates to a fall-proof ladder stringer, said ladder being meant for allowing the acces from the ground to a height in order to carry out various works, wherein a ladder stringer (1) supporting some steps (2) identical or not in length, has a cross section (a), which is provided, on a side, with a bridge (b) communicating with a run way (c) whereon a fall proofing device may slide.
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