Artificial intelligence probably wasn't on Warren Buffett's mind when he bought some of these incredible stocks.Warren Buffett is the CEO of the Berkshire Hathaway (BRK.A 0.70%) (BRK.B 0.68%) holding company, but he will relinquish the role at the end of this year. He will continue to serve as chairman of the board, so his brand of long-term value investing will endure, which is great news for shareholders.Since Buffett took control of Berkshire in 1965, its stock has delivered a compound annual return of 1 ...