30 CFR § 23.12 Wording, purpose, and use of approval plate.
(a)Approval plate. (1) Manufacturers shall attach, stamp, or mold an
approval plate on each permissible device. The plate shall bear the emblem of
the Mine Safety and Health Administration and be inscribed as follows:
Permissible Telephone (or Permissible Signaling Device) Approval No.----Issued
to the -----------------------------------------------------------------------
Company.
(2) When deemed necessary, an appropriate caution
statement shall be added. The size and position of the approval plate shall
be satisfactory to MSHA.
(b)Purpose. The approval plate is a label that identifies the device
so that anyone can tell at a glance whether or not it is of the permissible
type. By the plate, the manufacturer can point out that his device complies
with MSHA's requirements and that it has been approved for use in gassy or
dusty mines.
(c)Use. Permission to place MSHA's approval plate on his device
obligates the manufacturer to maintain the quality of his product and to see
that each device is constructed according to the drawings that have been
accepted by MSHA and are in MSHA's files. Devices exhibiting changes in
design that have not been authorized are not permissible and must not bear
MSHA's approval plate.
[Sched. 9B, 4 FR 1555, Apr. 11, 1939, as amended at 43 FR 12315, Mar. 24,
1978]
