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Prepayments and Other Current Assets (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Summary of prepayments and other current assets    
Prepaid land lease $ 4,242 $ 437,114
Prepayment for purchase of materials 51,719
Value-added tax recoverable 5,589,497 5,760,280
Others 337,272 43,905
Total prepayments and other current assets $ 5,982,730 $ 6,241,299