That is pretty interesting. What got you into that inquiry? I heard of each entity in it's own right (C. W. Post LIU; Merriweather Post Pavilion and its sponsor; Post cereal; Kellogg; etc.) but didn't know they all interconnected.
We were eating some Grape Nuts, and AtBC said it might be one of the greatest American inventions, so I wikied Grape Nuts and we hit the link to see where they were created. What did we do without the interwebz before??