BUZZ-Ballard Power Systems Inc: Signs two contracts
** Fuel cell maker's shares up 16.6 pct at $2.81 premarket
** Signs two fuel cell technology contracts, one with Ardica Technologies and one with an unnamed automotive equipment manufacturer
** Says contract with Ardica relates to work for a wearable fuel cell power system for military use
** Up to Friday's close, stock had fallen 71 pct since hitting 52-week high of $8.38 in March
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