C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS › PART 33—DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES › Subpart B—Dust-Collector Requirements

30 C.F.R. § 33.21

Modification of test equipment

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For test purposes the unit or system may be modified, such as by attaching instruments or measuring devices, at MSHA's discretion; but such modification shall not alter its performance.