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5. INVENTORY (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory

Inventories are stated at the lower of cost or net realizable value. Costs are determined using the first in-first out (FIFO) method. As of December 31, 2019 and 2018, inventory consists of the following:

 

   December 31, 
   2019   2018 
Finished goods  $716,478   $ 
Work in process   303,594    443,701 
Raw materials   835,232    698,689 
Inventory allowance   (11,424)   (11,424)
Total inventory  $1,843,880   $1,130,966