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Significant contingent liabilities and unrecognized contract commitments (Tables)
12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Capital Expenditures that are Contracted for, but not Provided for Capital expenditures that are contracted for, but not provided for are as follows:
    
December 31,
2020
    
December 31,
2021
 
    
NT$000
    
NT$000
 
Property, plant and equipment, net
  
 
2,331,041
 
  
 
2,629,129