[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR23.12]

[Page 139]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 23--TELEPHONES AND SIGNALING DEVICES--Table of Contents
 
Sec. 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]