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Significant contingent liabilities and unrecognized contract commitments (Tables)
12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Capital Expenditures that are Contracted for, but not Provided for
 b)
Capital expenditures that are contracted for, but not provided for are as follows:
 
   
December 31,
2019
   
December 31,
2020
 
   
NT$000
   
NT$000
 
Property, plant and equipment, net
  
 
1,640,712
 
  
 
2,331,041