CFR › Title 30 › Part 74Part 74 — Coal Mine Dust Sampling DevicesSubpart A — General§ 74.1— Purpose.§ 74.2— Definitions.Subpart B — Approval Requirements for Coal Mine Dust Personal Sampler Unit§ 74.3— Sampler unit.§ 74.4— Specifications of sampler unit.§ 74.5— Tests of coal mine dust personal sampler units.§ 74.6— Quality control.Subpart C — Requirements for Continuous Personal Dust Monitors§ 74.7— Design and construction requirements.§ 74.8— Measurement, accuracy, and reliability requirements.§ 74.9— Quality assurance.§ 74.10— Operating and maintenance instructions.§ 74.11— Tests of the continuous personal dust monitor.Subpart D — General Requirements for All Devices§ 74.12— Conduct of tests; demonstrations.§ 74.13— Applications.§ 74.14— Certificate of approval.§ 74.15— Approval labels.§ 74.16— Material required for record.§ 74.17— Changes after certification.§ 74.18— Withdrawal of certification.