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Payables to Former Subsidiaries (Tables)
6 Months Ended
Jun. 30, 2019
Payables To Former Subsidiaries  
Schedule of payable to a former subsidiary
   December 31,   June 30, 
   2018   2019 
BAK Tianjin  $972,913   $- 
BAK Shenzhen   3,328,733    2,850,674 
   $4,301,646   $2,850,674