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American companies established in 1963
Cable television companies of the United States
Companies based in Philadelphia
Companies listed on the Nasdaq
Conglomerate companies of the United States
Entertainment companies established in 1963
Entertainment companies of the United States
Internet service providers of the United States
Mass media companies established in 1963
Mass media companies of the United States
Multinational companies headquartered in the United States
Roberts family (Comcast)
Telecommunications companies of the United States
VoIP companies of the United States