NBC Television

The National Broadcasting Company is an American English language commercial broadcast television network that is a flagship property of NBCUniversal, a subsidiary of Comcast. The network is headquartered in the Comcast Building at Rockefeller Center in New York City, with additional major offices near Los Angeles , Chicago and soon in Philadelphia at Comcast Innovation and Technology Center. Wikipedia*

On the C-SPAN Networks:
The National Broadcasting Company is an American English language commercial broadcast television network that is a flagship property of NBCUniversal, a subsidiary of Comcast. The network is headquartered in the Comcast Building at Rockefeller Center in New York City, with additional major offices near Los Angeles , Chicago and soon in Philadelphia at Comcast Innovation and Technology Center..