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Shares of Schlumberger Ltd. (NYSE: SLB) were up marginally in premarket hours on news the company beat fourth-quarter earnings expectations. The oil-field services giant reported record North American revenue thanks to new technologies and structural efficiencies. SLB said fourth-quarter adjusted earnings finished at $1.50 a share, besting consensus per-share estimates of $1.45. The company announced plans to slash 9,000 jobs, or 7% of its workforce, as concerns about falling oil prices continue to affect the oilfield-service giant's efforts to maintain costs.