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

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312.13. Duties of the diver’s tender: The diver underwater must always be assisted by a diver’s tender who must
(1)  constantly monitor the diver’s lifeline; and
(2)  see to the operation of the breathing mixture supply and distribution system used by the surface-supplied diver.
O.C. 425-2010, s. 3.