30 CFR § 28.24
Revocation of certificates of approval.
MSHA reserves the right to revoke, for cause, any certificate of approval
issued pursuant to the provisions of this part. Such causes include, but are
not limited to, misuse of approval labels and markings, misleading
advertising, violations of section 110(h) of the Federal Mine Safety and
Health Act of 1977 and failure to maintain or cause to be maintained the
quality control requirements of the certificate of approval.
[37 FR 7562, Apr. 15, 1972, as amended at 43 FR 12316, Mar. 24, 1978]