§ 21.10 - Instructions for handling future changes in lamp design.

All approvals are granted with the understanding that the manufacturer will make his lamp according to the drawings which he has submitted to MSHA and which have been considered and included in the approval. Therefore, when he desires to make any change in the design of the lamp, he should first of all obtain MSHA's approval of the change. The procedure is as follows:

(a) The manufacturer shall write to Approval and Certification Center, Box 201B, Industrial Park Road, Dallas Pike, Triadelphia, W. Va. 26059 requesting an extension of his original approval and stating the change or changes desired. With this letter he should submit a revised drawing or drawings showing the changes in detail and one of each of the changed lamp parts.

(b) MSHA will consider the application and inspect the drawings and parts to determine whether it will be necessary to make any tests.

(c) If no tests are necessary the applicant will be advised of the approval or disapproval of the change through the Administrator's office.

(d) If tests are judged necessary the applicant will be advised of the material that will be required.