(225 ILCS 710/45.42)
(from Ch. 96 1/2, par. 4295)
In stopes timbered with square sets the working floors shall be closely and securely lagged over. Lagging shall be long enough to reach
entirely across the caps or girts, or shall reach to the center of the cap
or girt at each end and shall be spiked. Openings in the floor shall be
protected by railings.
(Source: Laws 1945, p. 1035