Which company successfully trademarked its specific shade of brown for use on delivery vehicles and services?

Brand colors are a crucial element of retail identity and marketing strategy, often invoking specific emotional responses and instant recognition. Major companies invest millions in researching, protecting, and promoting their signature colors. This trivia question explores how one particular company went to extraordinary legal lengths to protect its distinctive brand color as intellectual property.

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UPS (Pullman Brown)
Hershey's (Chocolate Brown)
Louis Vuitton (LV Brown)
Ferrero Rocher (Gold-Brown)