The National Brewing Company was a beer brewing company based in Baltimore, Maryland. The National Brewing Company operated from 1872 until the late 1970s. At the end of the 1970s, the National Brewing Company was purchased and their breweries were shut down. However, National's two most prominent brands, National Bohemian Beer and Colt 45, were kept alive and are now brewed in Wisconsin.
There are still many breweries functioning in Baltimore.
The article mentions that NBC once operated in Baltimore, but makes no mention of any other breweries that function in that particular city. I'm not sure why the system missed this one.