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The Mutual Broadcasting System (MBS) is a American English-language commerical broadcast television network that is the flagship property of MBS Corp. The network is headquartered at the MBS Building in New York City with an additional major office in Los Angeles (the Mutual Pictures backlot). 

MBS has fifteen owned and operated stations and nearly 200 affiliates throughout the United States and its territories, some of which are also available in Canada via pay-television providers or in border over-the-air. 

MBS is sometimes called the Pentagon Network in reference to is current and most famous logo, introduced on July 9, 1969.

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