0000898430-01-001307 424B5 1 20010409 NORTHROP GRUMMAN CORP /DE/ 0001133421 3812 DE 1231 424B5 33 333-54800 1598459 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 424B5 1 0001.txt FORM 424B5