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Prepaid Expenses (Tables)
12 Months Ended
Mar. 31, 2019
Prepaid Expenses Tables Abstract  
Schedule of prepaid expenses
   As of March 31, 
   2019   2018 
Deposit for purchase of raw materials  $5,940,447   $- 
Other prepaid expenses   110,087    28,298 
Total  $6,050,534   $28,298