3M ( MMM) said Tuesday that its third-quarter sales rose 6.2% from a year ago to $6.6 billion, thanks to double-digit growth in its three largest business units. Net income for the quarter was $991 million, or $1.41 a share, up from $960 million and $1.32 a share in the same period last year. Excluding items, 3M earned $1.42 a share in the most recent quarter, 4 cents ahead of estimates. Looking ahead, full-year earnings should be $5.40 to $5.48 a share, 3M said. Analysts are calling for $5.45. During the latest quarter, sales rose 10% in the industrial and transportation segment to $2 billion. In the health-care division, sales were up 10.7% to $1.1 billion, and safety, security and protection services had a 27.1% revenue increase to $974 million. 3M is one of the 30 stocks in the Dow Jones Industrial Average. Several other components reported their results earlier, as well, including DuPont ( DD), Caterpillar ( CAT) and Pfizer ( PFE).