# Relationship history for MSHA mine 1504051

Current hierarchy: **Vance William D → T B K Coal Company Inc → I-203**

- 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:** Ligon Preparation Company → I-203; 1950-01-01 to 1977-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Hall Hargis → I-203; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Hargis → Ligon Preparation Company; 1950-01-01 to 1977-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Ligon Preparation Company → I-203; 1977-08-21 to 1984-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield J Ronald → I-203; 1977-08-21 to 1984-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield J Ronald → Ligon Preparation Company; 1977-08-21 to 1984-07-16; source msha-controller-operator-history
- **operator_operates_mine:** T B K Coal Company Inc → I-203; 1984-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vance William D → I-203; 1984-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vance William D → T B K Coal Company Inc; 1984-07-17 to current/open; source msha-controller-operator-history