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Subchapter 17. Mine Safety Orders
Article 41. Telephones

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§7166. Telephones for Shaft Work.

When a shaft-sinking or shaft-deepening operation reaches a depth of 100 feet below the shaft-sinking hoist, a telephone system shall be installed for communication between the shaft crew and the hoistman.
It is recommended that a portable type of telephone be provided for the shaft crew so that it can be kept near their working place during working hours.

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