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                                        Casing head 
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          Cross and Tee 
          Wellhead assembly 
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                                                  PetroChina network card(7)
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  PetroChina network card(8)
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  Special equipment manufacturing license
                                                
          
                                                
                                            
          		
                                            
                                          
          
                                          
          
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  KQ65/78-105 Type test certificate
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  KQ65-70 Type test certificate
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  JG/YG65-70 Type test certificate
                                                
          
                                                
                                            
          		
                                            
                                          
          
                                          
          
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  PFF65-70 Type test certificate
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  Integral casing head type test certificate
                                                
          
                                                
                                            
          		
                                            
                                            
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  
                                                
          
                                                
          
                                                  Patent(1)
                                                
          
                                                
                                            
          		
                                            
                                          
          
                                          
          
                                            
                                          
          
                                      
          		
                                    
          
                                
          		
                              
          
                              
          
                                
                              
          
                              
          
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