Which company's advertising slogan holds the Guinness World Record for the longest continuously used slogan in advertising history?

Brand slogans can become iconic parts of our cultural landscape, but did you know some have broken world records? Test your knowledge about famous advertising taglines that have made history not just in marketing effectiveness, but in setting actual Guinness World Records. This question explores the fascinating intersection of advertising genius and record-breaking achievements.

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De Beers - 'A Diamond is Forever' (since 1948)
Coca-Cola - 'It's the Real Thing' (since 1942)
Maxwell House - 'Good to the Last Drop' (since 1915)
Avis - 'We Try Harder' (since 1962)