	investment firm raises certron crtn stake louart corp a los angeles investment firm said it raised its stake in certron corp to shares or pct of the total outstanding common stock from shares or pct in a filing with the securities and exchange commission louart said it bought certron shares between sept and march at a total of dlrs a share it said its dealings in certron were for investment only but said it might increase its stake it said it has no plans to seek control of the company reuter 
