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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT, NET [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, NET
NOTE 6 – PROPERTY, PLANT AND EQUIPMENT, NET

At December 31, 2021 and 2020, property, plant and equipment consisted of the following:

 
December 31,
  
   
2021
    
2020
  
Manufacturing equipment
  
$
7,973
    
$
5,966
  
Office equipment
    
2,012
      
1,047
  
Transportation equipment
    
217
      
216
  
Leasehold improvement
    
4,134
      
2,398
  
Total cost
    
14,336
      
9,627
  
Less: Total accumulated depreciation
    
(5,900
)
    
(3,745
)
Construction in progress
    
5,606
      
2,310
  
Total property, plant and equipment, net
  
$
14,042
    
$
8,192
  

Depreciation expense was $2,099, $826, and $713 the years ended December 31, 2021, 2020 and 2019, respectively. During the years ended December 31, 2021 and 2020, the Company retired certain fully depreciated manufacturing equipment with cost of $0 and $446, respectively.