30 C.F.R. § 56.14210 Movement of dippers, buckets, loading booms, or suspended loads.
Title 30 - Mineral Resources
(a) Dippers, buckets, loading booms, or suspended loads shall not be swung over the operators' stations of self-propelled mobile equipment until the equipment operator is out of the operator's station and in a safe location. (b) This section does not apply when the equipment is specifically designed to protect the equipment operator from falling objects.
Title 30: Mineral Resources
PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES
Subpart M—Machinery and Equipment
Safety Practices and Operational Procedures
§ 56.14210 Movement of dippers, buckets, loading booms, or suspended loads.

