Tesla's value drops $50 billion as Musk's promised cheaper battery three years away

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TESLA MTRS (NASDAQ: TSLA) Delayed: 375.30 --0 (-0%)
Previous Close $375.30    52 Week High $269.32 
Open $375.30    52 Week Low $141.05 
Day High $375.30    P/E N/A 
Day Low $375.30    EPS $-0.62 
Volume 445,408