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v3.20.1

Accounts and Notes Receivable, Net (Details 1) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019
Receivables [Abstract] |  |
Beginning balance | $ 21,191,849 | $ 19,291,772
provision for doubtful accounts | 3,159,302 | 2,601,781
Less: write-off |  |
Exchange rate effect | (262,596) | (701,704)
Ending balance | $ 24,088,555 | $ 21,191,849

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