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§ 84.301 Applicability to new and previously approved CCERs.
(a) Any CCER approval issued after April 9, 2012 must comply with the technical requirements of subpart O.
(b) The continued manufacturing, labeling, and sale of closed-circuit apparatus previously approved under subpart H is authorized for units required for use in underground coal mines pursuant to 30 CFR 75.1714–1.