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Inventories (Tables)
6 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories are summarized as follows:

  

    December 31,     June 30,  
    2018     2018  
Raw material   $ 3,416,547     $ 3,540,205  
Work-in-process     324,932       180,442  
Finished goods     2,414,307       1,743,497  
      6,155,786       5,464,144  
Less valuation reserve     (444,258 )     (444,258 )
    $ 5,711,528     $ 5,019,886