{"data":{"chapter":"I","heading":"Modification of test equipment.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-B/part-33/subpart-B/section-33.21","part":"33","subchapter":"B","subpart":"B","id":"33.21","citation":"30 CFR 33.21","chapterHeading":"CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","subchapterHeading":"SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS","partHeading":"PART 33—DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES","subpartHeading":"","text":null},"meta":{"representation":"json","fullCorpus":"/data/title30-sections.json","snapshot":{"chapterCount":6,"featuredSectionCount":100,"latestAmendedOn":"2026-08-14","latestIssueDate":"2026-08-14","partCount":206,"sectionCount":5954,"upToDateAsOf":"2026-08-19"}}}