Answer:
Tires
Step-by-step explanation:
During much of the 20th century, Armstrong was a national leader in the production of tires in the US, but it ceased operations in Connecticut in 1980. It continued operating in other states until it was sold to Pirelli in 1988.
Connecticut is leader in the production of:
- Helicopters ⇒ Sikorsky Aircraft is based in Stratford, Connecticut.
- Jet and aircraft engines ⇒ UTC's Pratt & Whitney is based in East Hartford, Connecticut.
- Submarines ⇒ General Dynamics Electric Boat is based in Groton, Connecticut.