If you want a combination of logos and company mergers + spinoffs, I would vote for Standard Oil and AT&T. Here is an att site to get started:http://www.mattsapundit.com/2006/01/09/att-gets-new-logo-still-wont-sell-me-a-telegraph/and standard oil (only the history, no logos):http://en.wikipedia.org/wiki/Standard_Oilhttp://www.trademarks-logos.com/lgs_pet.htm Abusive comment hidden. (Show it anyway.)
Here is an att site to get started:
http://www.mattsapundit.com/2006/01/09/att-gets-new-logo-still-wont-sell-me-a-telegraph/
and standard oil (only the history, no logos):
http://en.wikipedia.org/wiki/Standard_Oil
http://www.trademarks-logos.com/lgs_pet.htm