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DO NOT SYNDICATE!!HOLD FOR OIL STORY A service rig crew performs maintenance and repair work on an oilfield pumpjack and well head site near Halkirk, Alta., June 20, 2007. Alberta’s oil pipeline hub, where millions of barrels of crude flow each day to pipelines that feed markets in Canada and the United States is a beehive of activity. But with rising expenses for labour, electricity, transportation and rig costs, oil producers are finding that the profit margins on US$70-per barrel oil aren’t that much different than when crude was $40 a barrel. (CP PHOTO/Larry MacDougal) CANADA