Exclusive-China's Nio explores investment, tech alliances with Mercedes-sources

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 4.63 +0.10 (2.21%)
Previous Close $4.53    52 Week High $14.86 
Open $4.59    52 Week Low $13.31 
Day High $4.64    P/E N/A 
Day Low $4.54    EPS $0.00 
Volume 24,691,103