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Foxconn, China’s largest private employer, pledged to sharply curtail workers’ hours and significantly increase wages — reforms that, if fully carried out next year as planned, could create a ripple effect that benefits tens of millions of workers across the electronics industry, employment experts say. Other reforms were more personal. Protective foam sprouted on low stairwell ceilings inside factories. Automatic shut-off devices appeared on whirring machines. Ms. Pu got her chair. This autumn, she even heard that some workers had received cushioned seats.