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                                        Casing head 
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                                                  PetroChina network card(6)
                                                
          
                                                
                                            
          		
                                            
                                          
          
                                          
          
                                            
                                          
          
                                      
          		
                                    
          
                                
          		
                              
          
                              
          
                                
                              
          
                              
          
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