How does a Petzl Croll Work?

https://www.rescueresponse.com/shop/croll-chest-ascender/ How does a Petzl Croll Work? A Petzl Croll is an ascending device[1] used in caving and industrial rope access made by the French company Petzl. Its name comes from the town Crolles where Petzl’s company headquarters are located but might also be a reference to the nearby cave system of the Dent de …

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