MSHA - Code of Federal Regulations - 30 CFR 7.309
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MSHA - Title 30 CFR
30 CFR § 7.309
Approval making.

Each approved motor assembly shall be identified by a legible and permanent approval plate inscribed with the assigned MSHA approval number and a warning statement as specified in §7.306(d) of this part. The plate shall be securely attached to the motor assembly in a manner that does not impair any explosion-proof characteristics.

[57 FR 61198, Dec. 23, 1992]