30 CFR § 77.1110
Examination and maintenance of firefighting equipment.
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 47 FR 14706, Apr. 6, 1982; 60 FR 33719, June 29, 1995]