Firefighting equipment shall be continuously maintained in a usable and operative condition. Fire extinguishers shall be examined at least once every 6 months and the date of such examination shall be recorded on a permanent tag attached to the extinguisher.
30 C.F.R. §77.1110
Pub. L. No. 96-511 , 94 Stat. 2812 (44 U.S.C. 3501 et seq.)