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Inventories (Tables)
12 Months Ended
Feb. 28, 2021
Inventories Tables Abstract  
Inventories
   February 28,
2021
   February 29,
2020
 
Raw materials and subassemblies  $1,081,591   $967,089 
Finished goods   786,785    752,999 
Work in process   1,027,010    855,083 
Total   2,895,386    2,575,171 
Less: Allowance   (284,280)   (193,280)
Net inventories  $2,611,106   $2,381,891