Early systems of ascending ropes were developed by Pierre Chevalier in the Dent de Crolles cave system in France in the late 1930s, Chevalier also being the first to use nylon rope in a cave as opposed to natural fibre rope.
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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 Crolles, the exploration of which triggered a lot of technical effort leading to innovation in caving equipment.
Pursuing these developments, in the 1970s Fernand Petzl started a small caving equipment manufacturing company Petzl, which is today a world leader in equipment for both caving, mountaineering and at-height safety in civil engineering.