There is a newer version of the California Code
2009 California Labor Code - Section 7500-7501 :: Chapter 3. Underground Telephones
LABOR CODESECTION 7500-7501
7500. 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. 7501. The failure or refusal of any owner or lessee to install or maintain such telephone system is a misdemeanor.
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