MSHA accepts the non-MSHA product safety standards in their original form, or

an original approval or letter of certification requesting that the ..... file for the original approval or certification. MSHA will issue a formal

. (2) An extension of approval will not affect the original approval ..... number except that the extension number shall be added to the original ..... approval number on the approval plate. (Example: Original approval No. 2G-3000

part have been complied with in the original manufacture, rebuilding, or

service that is different from the original function, or a machine

alter the basic functional design that was originally approved for the

. Explosion-proof enclosures shall be restored to the state of original ..... . When any lead entrance is disturbed, the original leads or exact

assemblies meeting the original manufacturer's specifications are used as