NEW YORK (Reuters) – Billionaire Warren Buffett’s Berkshire Hathaway Inc revealed on Monday new investments in Nestle AG and Exxon Mobil Corp , respectively the world’s largest food maker and oil company, and that it has nearly doubled its investment in Wal-Mart Stores Inc , the world’s largest retailer.

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Berkshire buys Nestle, Exxon; ups Wal-Mart stake