Looking to become the biggest fast food chain in America, McDonald's chief Ray Kroc approached Coca-Cola in 1955 to create a partnership with the already well-established soda brand. One meeting and a handshake later and the pair haven’t looked back. In the early days McDonald’s used Coca-Cola’s offices to get up and running and McDonald’s is now Coca-Cola’s biggest customer. Pictured is a McDonald’s advert from 1975.

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