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Prepayments and other current assets (Details) - Schedule of prepayments and other current assets - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of prepayments and other current assets [Abstract] |  |
Prepaid land lease | $ 185,031 | $ 183,912
Prepayment for purchase of materials | 7,804,227 | 10,945
Value-added tax recoverable | 14,565,106 | 5,864,989
Others | 443,245 | 991,669
Total | $ 22,997,609 | $ 7,051,515

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- Definition Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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