Northrop Grumman acquired Litton Industries in 2000 .
This eventually heralded , in 2004 , the end of the use of the Decca name on radars after a period of more than 50 years .
Northrop Grumman acquired Litton Industries in 2000 and this eventually heralded , in 2004 , the end of the use of the Decca name on radars after a period of more than 50 years .