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Inventories (Tables)
9 Months Ended
Nov. 30, 2018
Inventories Tables Abstract  
Inventories
   November 30,   February 28, 
   2018   2018 
Raw materials and subassemblies  $872,430   $673,969 
Finished goods   650,401    395,410 
Work in process   472,432    489,082 
Total   1,995,263    1,558,461 
Less: Allowance   (252,378)   (204,378)
Net inventories  $1,742,885   $1,354,083