Okla. Stat. tit. 40, § 40-178: Damages for injury

An employer shall be responsible in damages for personal injury

caused to an employee, who, was himself in the exercise of due care

and diligence at the time he was injured, by reason of any defect in

the condition of the machinery or appliances connected with or used

in the business of the employer which arose, or had not been

discovered or remedied owing to the negligence of the employer, or

of any person entrusted by him with the duty of inspection, repair,

or of seeing that the machinery or appliances were in proper

condition.