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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2021
INVENTORIES  
Schedule of components of inventories

March 31, 

December 31, 

    

2021

    

2020

Parts and raw materials

$

164,316

$

141,337

Work in process

 

18,900

 

13,702

Finished goods

 

64,351

 

66,307

Total

$

247,567

$

221,346