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Ben & Jerry, theSkimm & Apple: The Inspiring Stories of 10 Famous Co-Founders

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1) William Procter & James Gamble (P&G). Talk about a co-founder relationship being personal: William Procter and James Gamble, co-founders of what would become one of the world's largest companies, were brothers-in-law. So in 1837, they took their father-in-law's advice and Procter & Gamble was born.