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Inventories (Tables)
9 Months Ended
Nov. 30, 2012
Inventories Tables  
Inventories
   November 30,   February 29, 
   2012   2012 
         
Finished goods  $824,449   $905,142 
Work in process   536,798    544,805 
Consignment   9,449    7,127 
Raw materials and subassemblies   1,166,622    1,295,938 
Total   2,537,318    2,753,012 
Less: Allowance   (241,885)   (193,884)
Net inventories  $2,295,433   $2,559,128