This is the first of two patents held by Louis-Eugène Morel. It shows his signature sealed aluminium body and rubber boot covering the sliding rod mechanism. The sliding rod is driven by a toothed wheel rotated by the cable.

This patent covers a mechanism with a single pulley wheel.

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• Publisher: L’Institut national de la propriété industrielle
• Inventor: Louis-Eugène Morel
• Country: France
• Date: French application December 1949
• Derailleur brands: Morel
• Derailleurs: Morel single pulley design