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Books about Petzl:
Petzl la Promesse des Profondeurs
Fritz Westphal und Josef Petzl: Gezeichnete Tagebucher zur Zeit des Biedermeier (German Edition) by Ulrich Schulte-Wulwer (1993)
Bay. Reisebilder fur Herzblatt Victorine: Joseph Petzl (1803-1871 Munchen), Handzeichungen und Aquarelle : [Ausstellung... by Heidi Hepner (1988)
Wiki information Petzl:
Petzl is a manufacturer of climbing gear, caving gear, work-at-height equipment, and headlamps based in Crolles, France. The company was created by the cave explorer Fernand Petzl in the mid-1970s. Their three specialties are: Vertical sports:...
A Petzl Croll is an ascending device 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...