The american equivalent is United States Steel (which is owned by the Japanese ironically.)
>> The most important rivers flowing at least partially through North Rhine-Westphalia include: the Rhine, [...]
I concede that I missed your Riverine connection between Missouri-Rhine but I think the first guy was focusing on the majesty/exotic-ness of "Rheinmetall" while "Missouri Metalworks" just sounds lame, most likely due to the fact that its fake!