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MarkWest Energy Partners Completes Acquisition of Keystone Midstream Services

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners. L.P. (NYSE:MWE) today announced the closing of the previously announced acquisition of Keystone Midstream Services, LLC (Keystone) from Stonehenge Energy Resources, L.P., and subsidiaries of Rex Energy Corporation (Rex Energy) (NASDAQ:REXX) and Sumitomo Corporation (Sumitomo).