30 CFR § 23.10
Material required for MSHA records.
In order that MSHA may know exactly what it has tested and approved, it keeps
detailed records covering each investigation. These records include drawings
and actual equipment as follows:
(a) Drawings. The original drawings submitted with the application
for the tests and the final drawings which the manufacturer must submit to
MSHA before the approval is granted, to show the details of the device as
approved. These drawings are used to identify the device in the approval and
as a means of checking the future commercial product of the
(b) Actual equipment. If MSHA so desires, parts of the devices that
are used in the tests will be retained as records of the equipment submitted.
If the device is approved, MSHA reserves the right to require the
manufacturer to submit one, with the approval plate attached and without cost
to MSHA, as a record of his commercial product.