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Inventories (Tables)
12 Months Ended
Feb. 29, 2020
Inventories Tables Abstract  
Inventories
   February 29,
2020
   February 28,
2019
 
Raw materials and subassemblies  $967,089   $873,483 
Finished goods   752,999    571,640 
Work in process   855,083    483,271 
Total   2,575,171    1,928,394 
Less: Allowance   (193,280)   (270,378)
Net inventories  $2,381,891   $1,658,016