There is a newer version of the Revised Code of Washington
2005 Washington Revised Code RCW 49.24.310: Telephone system for tunnels.
Where tunnels are driven from shafts more than two hundred and fifty feet deep, a telephone system shall be established and maintained, communicating with the surface at each such shaft, and with a station or stations readily and quickly accessible to the men at the working level.
[1941 c 194 § 24; Rem. Supp. 1941 § 7666-32.]
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