E.ON BKK

== Ruhrgas BKK ==
=== ????-2003 ===
== BKK E.ON Ruhrgas ==
=== 2003-2007 ===
== E.ON Betriebskrankenkasse ==
=== 2007-2016 ===
Category:1952
Category:1950s
Category:Essen
Category:North Rhine-Westphalia
Category:Germany
Category:Health insurance
Category:Insurance companies in Germany
Category:Defunct