30 C.F.R. § 57.19093 Standard signal code.
Title 30 - Mineral Resources
A standard code of hoisting signals shall be adopted and used at each mine. The movement of a shaft conveyance on a “one bell” signal is prohibited.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart R—Personnel Hoisting
Signaling
§ 57.19093 Standard signal code.
