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                Patent Certificate of measurement device for resistivity
                 
              
        
            
        		
          
        
          
        
            
          
        
          
        
            
        
              
        
                 
                
                 
              
        
            
        		
          
        
        
        		
         
      
        
    
        		
  
        
  
        
     
  
        
  
        
    
        
      
        
         
      
        
      
        
        
        
          
        
             
            
        
              
        
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