Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Oge: Ruo ọtụtụ afọ, a na-ejikọta NBC na David Sarnoff, onye jiri ya dịka ụgbọ iji ree ngwá electronic. RCA na Sarnoff jidere ihe ngosi site na iwebata telivishọn elektrọnik niile na ọha na eze na 1939 <unk> 40 New York World's Fair, n'otu oge ahụ na-amalite usoro ihe omume mgbe niile na ụlọ ọrụ telivishọn NBC-RCA na New York City. Onye isi ala Franklin D. Roosevelt pụtara na ngosi ahụ n'ihu igwefoto NBC, na-aghọ onye isi ala US mbụ pụtara na telivishọn na Eprel 30, 1939 (e nwere ezigbo foto nke FDR na David Sarnoff Library). A na-agbasa mgbasa ozi site na ụlọ ọrụ telivishọn NBC nke New York W2XBS Channel 1 (mgbe e mesịrị WNBC-TV; ugbu a WNBC, ọwa 4) ma hụ ihe dị ka ndị na-ekiri 1,000 n'ime ebe mkpuchi nke ihe dị ka kilomita 40 (64 km) site na onye na-enye ya na Empire State Building.  Ajụjụ: Olee ebe ụlọ ọrụ redio WNBC nke dị na New York si malite ịgbasa ozi?
Ụlọ elu Empire State