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2. INVENTORIES (Details) - USD ($)
Mar. 31, 2019
Jun. 30, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 483,090 $ 500,908
Work-in-progress 443,341 434,536
Finished goods 203,415 208,624
Total inventories $ 1,129,846 $ 1,144,068