Minnesota Public Radio slideshow:
Part 4: The company
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3M's Dr. Larry Zobel says the company was not trying to conceal findings about the chemical contamination -- rather it wanted to verify data before reporting the findings to the EPA. (MPR Photo/Mike Edgerly)

3M's Dr. Larry Zobel says the company was not trying to conceal findings about the chemical contamination -- rather it wanted to verify data before reporting the findings to the EPA.

(MPR Photo/Mike Edgerly)
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