{"data":{"id":"us/30-cfr-56.19090","jurisdiction":"us","citation":"30 CFR 56.19090","heading":"Dual signaling systems.","body":"There shall be at least two effective approved methods of signaling between each of the shaft stations and the hoist room, one of which shall be a telephone or speaking tube.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES","Subpart R—Personnel Hoisting"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"ca13fd8d42191ce157090b7045c3e2abce15f3fef8a4d71dbf6682c90012f998","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-56.19083","next":"us/30-cfr-56.19091"},"notice":"GroundRules: Original legal text. Not legal advice."}