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3. Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of :  

September 30,

2019

   

December 31,

2018

 
Materials   $ 1,032,815     $ 2,043,843  
Work in process     94,491       121,624  
Finished goods     5,214,486       5,762,211  
Total   $ 6,341,792     $ 7,927,678