Rockwell

Rockwell was a pre-War company that manufactured heavy weapons like the CZ53 personal minigun, the CZ57 Avenger minigun and the BigBazooka

Mentions
Rockwell products appear in Fallout, Fallout 2, Fallout: New Vegas and Fallout Tactics.

Real World
The real world equivalent would be Rockwell International which made the Space Shuttle and the B-1 Lancer, amoung many other products.