The National Broadcasting Firm (NBC) is an American English-language industrial terrestrial radio and television network that is a flagship house of NBCUniversal, a subsidiary of Comcast. The network is headquartered at 30 Rockefeller Plaza in New York City, with additional big offices near Los Angeles (at 10 Universal City Plaza), https://umao.blogsvirals.com/24246406/some-ideas-supplements-and-strategies-for-sports