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(a) The operator of every mine shall provide and maintain on the surface a check list by which every man shall be checked into and out of the mine on each shift.
Note: This may be done by several methods, such as the use of time cards, numbered cap lamps, check boards with metal checks, having the employee report to a clerk or timekeeper when he enters or leaves the mine, or any other method acceptable to the Division.
(b) At the end of the shift the check list shall be examined to see if all men are out of the mine, except men who are authorized to remain therein.
If the check list indicates that an unauthorized employee remains in the mine, a prompt search shall be made for the missing man.