S-2.1, r. 13 - Regulation respecting occupational health and safety

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312.24. Features of the voice communication system: The communication system referred to in section 312.23 must
(1)  have a transmission quality that allows the diver’s breathing to be clearly heard; and
(2)  be equipped with a voice unscrambler if a gas mixture containing helium or other sound-distorting gas is used.
O.C. 425-2010, s. 3.