OKLAHOMA CITY (AP) - Two key parts of an Oklahoma workers' compensation law that was overhauled in 2013 have been struck down in recent weeks. A trial attorney who doesn't like the law's provisions expects more of them to be nullified. State Supreme Court justices last week said it was unfair deny relief to workers who suffer cumulative injuries in their first six months. And in a case involving another portion of the law, the Oklahoma Workers' Compensation Commission said in late February that legislators improperly gave some employers the right to define the injuries for which compensation might be due.