| 摘要 |
A guardrail comprises two parallel metal tubes each having two lengthwise bent ends each having a fastening member, two inner abutment mechanisms each having a lengthwise abutment member and a mating fastening member at either end engaged with the fastening member for securing each metal tube and the corresponding abutment mechanism together, and a protective board having either end urged against the abutment member and the bent ends, thereby securing the protective board between the abutment mechanisms. Further, a number of variations are possible.
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