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20. Cost of sales (Tables)
12 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Schedule of cost of sales
COG-Material Purchases   5,907 
COG-Service   1,436 
COG-Other   12,003 
COG - Monitoring   204,891 
COG-Shipping & Packaging   21,570 
      
    245,808