Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Grumman Aircraft Engineering Corporation, nke mechara bụrụ Grumman Aerospace Corporation, bụ onye na-emepụta ụgbọ elu ndị agha na ndị nkịtị na narị afọ nke 20 na United States. Tọrọ ntọala na Disemba 6, 1929, site na Leroy Grumman na ndị mmekọ, ọ jikọtara na 1994 na Northrop Corporation iji mepụta Northrop Grumman.  Ajụjụ: Gịnị ka ụlọ ọrụ Grumman nke na-arụ ụgbọelu gbanwere aha ya?
Grumman Aerospace Corporation