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. (Pub. L. No. 96-511, 94 Stat. 2812 (44 U.S.C. 3501 et seq.)) [36 FR 9364, May 22, 1971, as amended at 60 FR 33723, June 29, 1995]