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5. INVENTORIES, NET (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
    December 31,     December 31,  
    2020     2019  
Finished goods   $ 1,248,893     $ 653,323  
Work in process     64,451       413  
Raw materials     1,342,046       1,590,805  
Inventories, net   $ 2,655,390     $ 2,244,541