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2. INVENTORIES (Details) - USD ($)
Mar. 31, 2021
Jun. 30, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 609,128 $ 653,678
Work-in-progress 517,114 665,593
Finished goods 823,039 877,973
Total inventories $ 1,949,281 $ 2,197,244