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Property, plant and equipment, net
12 Months Ended
Mar. 31, 2015
Property, plant and equipment  
Property, plant and equipment, net
4Property, plant and equipment, net
  
 During the fiscal years ended March 31, 2013, 2014 and 2015, depreciation expenses charged to the consolidated statements of operations amounted to approximately $120,000, $1,086,000 and $1,082,000 respectively. As at March 31, 2014 and 2015, fully depreciated assets that were still in use by the Company amounted to $10,122,000 and $9,550,000, respectively.
  
 Property, plant and equipment in Shenzhen and Xinxing were assessed for impairment according to the policy described in note 1(h). The Company concluded that no impairment to property, plant and equipment in Shenzhen and Xinxing were required for the fiscal years ended March 31, 2014 and 2015.