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4. Inventories (Tables)
12 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
     2020       2019   
             
Raw materials   $ 1,838,500     $ 1,738,300  
Work-in-process     228,600       106,400  
Finished goods     817,600       747,600  
                 
    $ 2,884,700     $ 2,592,300