# Relationship history for MSHA mine 4201444

Current hierarchy: **Savage Companies → Savage Services Corporation → Savage Coal Terminal**

- 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

- **controller_controls_mine:** General Exploration Company → Savage Coal Terminal; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Swisher Coal Company → Savage Coal Terminal; 1977-11-01 to 1980-03-04; source msha-controller-operator-history
- **controller_controls_operator:** General Exploration Company → Swisher Coal Company; 1977-11-01 to 1980-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Coal Company → Savage Coal Terminal; 1980-03-05 to 1994-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Atlantic Richfield Company → Savage Coal Terminal; 1980-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlantic Richfield Company → Mountain Coal Company; 1980-03-05 to 1994-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Savage Companies → Savage Coal Terminal; 1993-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Savage Services Corporation → Savage Coal Terminal; 1994-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Savage Companies → Savage Services Corporation; 1994-09-09 to current/open; source msha-controller-operator-history