(225 ILCS 705/7.12) (from Ch. 96 1/2, par. 712)
Sec. 7.12.
At every mine where men are hoisted and lowered by machinery
there shall be provided means of signaling to and from the bottom man, the
top man and the engineer. The signal system shall consist of a tube, or
tubes, or wire encased in wood or iron pipes, through which signals shall
be communicated by electricity, compressed air or other pneumatic devices
or by ringing a bell. When compressed air or other pneumatic devices are
used for signaling, provision must be made to prevent signal from repeating
or reversing.
(Source: Laws 1953, p. 701.)
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