Topic - New Hampshire Ball Bearings Inc.

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Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

NH explosion investigation focuses on acid room

By NORMA LOVE - Associated Press

Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

Explosion at NH ball bearings plant injures 15

By NORMA LOVE - Associated Press

Emergency crews from several towns work an area outside the New Hampshire Ball Bearing plant after an explosion, Monday, Feb. 10, 2014 in Peterborough, N.H. At least 13 people were injured, but a company spokeswoman says none of the injuries appears to be life-threatening. (AP Photo/Jim Cole)

New Hampshire ball bearing plant explosion injures at least 15

By Norma Love - Associated Press