# Relationship history for MSHA mine 5001166

Current hierarchy: **Davis Ronald & James Richards → Harley'S Trucking → Davis Block Pit And Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** M & E Crushing → Davis Block Pit And Plant; 1950-01-01 to 1979-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Holland Michael T → Davis Block Pit And Plant; 1950-01-01 to 1979-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Holland Michael T → M & E Crushing; 1950-01-01 to 1979-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Harley'S Trucking → Davis Block Pit And Plant; 1979-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Ronald & James Richards → Davis Block Pit And Plant; 1979-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Ronald & James Richards → Harley'S Trucking; 1979-06-05 to current/open; source msha-controller-operator-history