Self-Retracting Lifeline, a type or vertical fall arrestor. Very often used in conjunction with permanent ladders or the wire-rope laders used to access lighting trusses. Works much like the inertia reel mechanism of the seatbelt in your car: free movement until it senses a jerk, then it locks up.
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NOT TO BE USED WITHOUT PROPER TRAINING, and no substitute for common sense.
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