Indiana Code - Labor and Safety - Title 22, Section 22-10-11-6

Check-in and check-out system

Sec. 6. Each mine shall have a check-in and check-out system that
will provide positive identification upon the person of every
individual underground. An accurate record of the men in the mine,
which shall consist of a written record, or a check board, shall be
kept on the surface in a place that will not be affected in the event of
an explosion. Said record shall bear a number identical to the
identification check carried by the person underground.
(Formerly: Acts 1955, c.168, s.89.)

Last modified: May 27, 2006