Okla. Stat. tit. 45, § 45-419: Shaft hoisting engineers - Age and experience - Duties -

Loading and unloading.

All shaft hoisting engineers handling men or material must be

over twenty-one (21) years of age, familiar and experienced with

hoisting engines of the design which he is to operate and must have

been examined by a reputable physician and be able to show

certificate of health from said physician, showing no physical or

mental conditions or symptoms that might cause a loss of faculties

so as to interfere with the safe and efficient performance of his

duty at all times. It shall be the duty of the hoisting engineer to

watch over all machinery, including hoisting rope or cable, in his

charge and ascertain that all the equipment and conditions are in

conformity with the law. In the event of any defect in such

equipment, or violation of the law concerning same, he shall

immediately report same to the mine superintendent or other person

in charge of the mine operation. The hoisting engineer shall, at

the beginning of his shift and at the middle of his shift, inspect

his hoist equipment, particularly as to the brakes and clutch and

test same by at least one complete hoisting trip before men are

allowed to enter the tub or shaft conveyance. Where a station man

or tub hooker is used in any shaft, it shall be his duty to

supervise the loading and unloading of men or material at the bottom

of the shaft, and he shall supervise the signaling to the hoisting

engineer. The loading and unloading of men at the top of the shaft

at the beginning and end of each shift shall be supervised by an

employee of the operator.