Summary: Jan. 29 (Bloomberg) -- Ann Duignan, an analyst at JPMorgan Chase & Co., discusses Caterpillar Inc.'s forecast of 2013 earnings of $7 to $9 a share on revenue of $60 billion to $68 billion. Duignan talks with Bloomberg's Pimm Fox and Kathleen Hays on Bloomberg Radio's "Taking Stock." (Source: Bloomberg)
