Buyout firm latest to put money into once-hyped transportation device.
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A retro technology is getting renewed interest as high-tech power storage.
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The automaker plans a low-speed scooter that can morph into a street-legal dune buggy.
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Cold War-era idea for an electric motor is finally getting its road test.
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Hybrids may be all the rage, but some still long for all-electric cars. And a few companies hope to capitalize on a technology that just won’t die.
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