Just because a company is transglobal in scope doesn't mean it's the same company everywhere. [1] My friend Mark [2] works for a large international company, Siemens.
Not to be confused with Siemens Stromberg Carlson, which is across the street from him. Nor from Siemens Rolm, which, if it still exists, is down the street from him. I don't recall exactly which Siemens he works for (and for that matter, I doubt if Mark recalls either) but while they may be all wholly owned subsidiaries of Siemens, they are in fact, vicious enemies that charge each other twice as much for the same equipment their competitors would sell them.
Why this should be remains a mystery that only PHB (Pointy Haired Boss)s can fully understand (without their heads exploding).
[1] http://www.aigeek.com/laptop/