§ 7500
57 words·~1 min read·
/ca/labor-code/7500A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
In all mines operated in the State where a depth of more than five hundred feet underground has been reached, a telephone system shall be established, equipped and maintained by the owners or lessees of the mine with stations at each working level below the depth aforesaid, communicating with a station on the surface of the mine.