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Ancien panneau de signalisation routière, Chédigny 🇫🇷
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Dès le lendemain de la première guerre mondiale, André Michelin entreprend seul l’étude d’un appareil de signalisation qui regrouperait sur un seul support toutes les indications nécessaires au bon cheminement de l’automobiliste. En ce qui concerne les panneaux indicateurs, André Michelin eut l’idée d’utiliser des plaques de lave émaillée.
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