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2. INVENTORIES (Details) - USD ($)
Dec. 31, 2019
Jun. 30, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 723,482 $ 578,856
Work-in-progress 429,268 409,019
Finished goods 866,445 746,729
Total inventories $ 2,019,195 $ 1,734,604