Electric Boat, the Groton-based subsidiary of General Dynamics Corp., is ramping up to build two subs a year, with the start of design of the Columbia-class ballistic missile submarine. More than 5,000 firms in the U.S., including nearly 450 in Connecticut, supply parts. In Connecticut, where the number of low-paid jobs are increasing faster than work with higher compensation, defense industry manufacturing jobs are prized for their pay.
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