June 8 (Reuters) - Chubu Gas Co Ltd  9540.NG : 
     
    * Says Rating and Investment Information, Inc. (R&I) 
downgraded the company's issuer rating to "BBB+" from "A-" 
    * Says rating outlook stable 
     
    Source text in Japanese: https://goo.gl/t6CzzH 
    Further company Coverage:  9540.NG  
 
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