UPDATE 1-Halliburton plea may help BP in spill liability battle
* Efforts to settle case seen as part of capital strategy * Halliburton shares rise 3.7 pct on share buybacks * Prospect of global settlement of liability deemed remote (Adds expert comment, Halliburton legal costs total) By Braden Reddall and Mica Rosenberg July 26 (Reu
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