Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) has minted many millionaires during the past six decades. If you had invested $10,000 in Berkshire on May 10, 1965 — the day Warren Buffett’s investment fund took full control of the struggling textile maker — your investment would be worth a whopping $381.9 million today. Under Buffett, Berkshire li…