Avondale Shipyard
Avondale Shipyard was an independent shipbuilding company , acquired by Litton Industries , in turn acquired by Northrop Grumman Corporation . 
<triplet> Avondale Shipyard <subj> shipbuilding <obj> industry <subj> Northrop Grumman <obj> parent organization <triplet> Litton Industries <subj> Northrop Grumman <obj> parent organization <triplet> Northrop Grumman <subj> shipbuilding <obj> industry <subj> Litton Industries <obj> owner of