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| Assures a blocking of the structure and is obligatory for the labour protection. |
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| Assures a blocking of the structure (enables an adjustement from 2.10 m to 3.90m) and is obligatory for the labour protection. |
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| It's placed at the top of the scaffolding structure ; can receive either boards or a fixed guardrail. |
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| Assure a blocking of the structure but is not used in any case for the worker protection. It's adjustable in spacing and it's used diagonally with the GTP16 and GTP17 couplers. |
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| Assure a blocking of the structure (enables an adjustement in spacing) and is obligatory for the worker protection. |
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