Petroleum
    
                    
    
        
        
            
            Liquefied Natural Gas / Fuel Oil
                     
     
                                                             
    
        
        
            
            Distillation / Oil Refinery
                     
     
                                                                                                     
    
        
        
            
            Petroleum Reservoir / Petroleum
                     
     
                     
    
        
        
            
            Pump / Bearing (Mechanical)
                     
     
                                                             
    
        
        
            
            Operations Research / Petroleum
                     
     
                     
    
        
        
            
            Fire Sprinkler System / Firefighting
                     
     
                     
    
        
        
            
            Cracking (Chemistry) / Petroleum
                     
     
                     
    
        
        
            
            Petroleum / Hydraulic Fracturing
                     
     
                     
    
        
        
            
            Chemical Bond / Molecules
                     
     
                     
    
        
        
            
            Distillation / Transparent Materials
                     
     
                                                             
    
        
        
            
            Natural Gas / Greenhouse Gas
                     
     
                     
    
        
        
            
            Hydraulic Fracturing / Waste
                     
     
                                                      
        
    
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