30 CFR § 20.13
The manufacturer shall attach, stamp, or mold an approval plate on the
battery container or housing of each permissible lamp. The plate shall bear
the emblem of the Mine Safety and Health Administration, and be inscribed as
follows: "Permissible ------- Lamp. Approval No.-------------- issued to the
--------------- Company." When deemed necessary, an appropriate caution
statement shall be added. The size, material, and position of the approval
plate shall be satisfactory to MSHA.
(a) Purpose of approval plate. The approval plate is a label which
identifies the lamp so that anyone can tell at a glance whether the lamp is
of the permissible type or not. By it the manufacturer can point out that his
lamp complies with specifications of MSHA and that it has been adjudged safe
for use in gassy and dusty mines.
(b) Use of approval plate. Permission to place MSHA's approval plate
on his lamp obligates the manufacturer to maintain the quality of his product
and to see that each lamp is constructed according to the drawings which have
been accepted by MSHA for this lamp and which are in the MSHA files. Lamps
exhibiting changes in design which have not been approved are not permissible
lamps and must not bear MSHA's approval plate.
(c) Withdrawal of approval. MSHA reserves the right to rescind for
cause at any time any approval granted under this part.
[Sched. 10C, May 17, 1938, as amended at 5 FR 3467, Aug. 30, 1940; 43 FR
12314, Mar. 24, 1978]