(225 ILCS 705/17.03) (from Ch. 96 1/2, par. 1703)
Sec. 17.03.
When not undercut or sheared, the entry and crosscut may be advanced concurrently, but no room shall be opened in advance of the last open crosscut; and after the entry has advanced 15 feet beyond the location of a new crosscut, only one shot shall be fired in the entry to two in the crosscut at the same shooting time.
(Source: Laws 1953, p. 701.)