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

June 30,

2019

   

December 31,

2018

 
Materials   $ 810,253     $ 2,043,843  
Work in process     267,522       121,624  
Finished goods     5,674,719       5,762,211  
Total   $ 6,752,494     $ 7,927,678