0000950130-01-502234 S-4/A 1 20010607 NORTHROP GRUMMAN CORP /DE/ 0001133421 3812 954840775 DE 1231 S-4/A 33 333-61506 1656212 1840 CENTURY PK E C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 3105536262 1840 CENTURY PARK EAST C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 NNG INC 20010129 S-4/A 1 ds4a.txt AMENDEMENT #1 FORM S-4