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Table 8 Example product categories

From: How does the position of firms in the supply chain affect their performance? An empirical study

Level 0   Level 1   Level 2   Level 3  
15 Engine 1515 Gas fuel injection system 151502 Fuel rail   
     151504 Fuel injector 15150402 Fuel injection nozzle
       15150404 Fuel injection nozzle holder
     151506 Electronic throttle control system   
     151508 Throttle body 15150802 Throttle valve
     151510 Air flow meter   
     151512 Pressure regulator   
     151514 Idle rotation control valve   
     151516 Swirl control valve   
      Fuel rail