BUZZ-Ballard Power Systems: Chinese motor maker takes stake in company
** Canadian fuel cell maker's U.S.-listed shares shares up 9.3 pct at $2 premarket
** Company said on Tuesday that Chinese motor maker Zhongshan Broad-Ocean Motor Co Ltd took 9.9 pct stake in it for $28.3 mln to become largest shareholder
** Ballard also posted smaller Q2 loss as gross margins rose
** Up to Tuesday's close, stock had risen 17 pct this year
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