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Inventories (Tables)
6 Months Ended
Aug. 31, 2018
Inventories Tables Abstract  
Inventories
   August 31,   February 28, 
   2018   2018 
Raw materials and subassemblies  $871,012   $673,969 
Finished goods   602,099    395,410 
Work in process   418,054    489,082 
Total   1,891,165    1,558,461 
Less: Allowance   (240,378)   (204,378)
Net inventories  $1,650,787   $1,354,083