Tesla Motors Inc. shares turned higher Monday after Chief Executive Elon Musk tweeted the electric-car maker will unveil a "major new product line" on April 30 at its Hawthorne, Calif., design studio. Musk said the new product isn't a car, but kept mum on any other details. Last year, a couple of Musk's tweets set off weeks of speculation surrounding Tesla's Model S, and the new features turned out to be souped-up versions of the luxury sedan. Tesla shares traded as low as $181.80 on Monday.
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