Ohio Revised Code Title XLI. Labor and Industry § 4113.05

(A) Any defect or unsafe condition in the ways, works, boats, wharves, plant, machinery, appliances, or tools, except simple tools, in any way connected with or in any way used in the business of the employer;

(B) The negligence of any person engaged as superintendent, manager, foreman, inspector, repairman, signalman, or any person in any way having charge, care, or control of such ways, works, boats, wharves, plant, machinery, appliances, or tools;

(C) The negligence of any person in charge of or directing the particular work in which the employee was engaged at the time of the injury or death;

(D) The negligence of any person to whose orders the employee was bound to conform, and by reason of his having conformed thereto the injuries or death resulted;

(E) The negligent act of any fellow servant done in obedience to the immediate or peremptory instructions or orders given by the employer, or any person with authority to direct the doing of said act;

(F) The want of necessary and sufficient rules and regulations for the government of such employees and the operation and maintenance of such ways, works, boats, wharves, plant, machinery, appliances, or tools.