: Usually required for ladders exceeding 5 meters in height.
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features a curved metal safety cage (or "crinoline") enclosing the climbing path. This cage provides a psychological sense of security and, more importantly, prevents a falling climber from tumbling backward away from the ladder. In Italy and Europe, these structures are heavily governed by standards such as UNI EN ISO 14122-4 : Usually required for ladders exceeding 5 meters in height
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