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§ 84.83 Timers; elapsed time indicators; remaining service life indicators; minimum requirements.
(a) Elapsed time indicators shall be provided for apparatus with a chemical oxygen source, except:
(1) Apparatus used for escape only; or
(2) Liquefied breathing gas apparatus equipped with gages visible to the wearer which indicate the remaining liquid content in the container.
(b) The timer or other indicator shall be accurately calibrated in minutes of remaining service life.