# Relationship history for MSHA mine 4000579

Current hierarchy: **Higgins Daniel → Higgins Coal Company Inc → No 25**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Walnut Coal Company Inc → No 25; 1950-01-01 to 1976-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Tennessee Consolidated Coal Company Inc → No 25; 1950-01-01 to 1976-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Tennessee Consolidated Coal Company Inc → Walnut Coal Company Inc; 1950-01-01 to 1976-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Walnut Coal Company Inc → No 25; 1976-09-01 to 1984-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 25; 1976-09-01 to 1984-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Walnut Coal Company Inc; 1976-09-01 to 1984-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Higgins Coal Company Inc → No 25; 1984-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Higgins Daniel → No 25; 1984-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Higgins Daniel → Higgins Coal Company Inc; 1984-01-30 to current/open; source msha-controller-operator-history