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Property, plant and equipment, net (Tables)
12 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment, stated at cost less accumulated depreciation
  September 30,
2018
  September 30,
2017
 
       
Office equipment $39,755  $46,214 
Vehicles  68,307   17,976 
Machinery and equipment  98,414   93,337 
Leasehold improvements  117,645   121,448 
Subtotal  324,121   278,975 
Accumulated depreciation and amortization  (187,758)  (176,459)
Total $136,363  $102,516