# Relationship history for MSHA mine 1512011

Current hierarchy: **Coble Robert L → Four B & C Coal Company Inc → No 1**

- 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:** Conroy  Coleman  et al → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blair Ernest → No 1; 1977-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coleman & Runyon Coal Company → No 1; 1979-08-01 to 1982-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Conroy  Coleman  et al → Coleman & Runyon Coal Company; 1979-08-01 to 1982-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Runyon Coal Company → No 1; 1982-02-17 to 1984-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Runyon Charles → No 1; 1982-02-17 to 1984-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Runyon Charles → Runyon Coal Company; 1982-02-17 to 1984-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Coble Robert L → No 1; 1984-07-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blair Coal Company Inc → No 1; 1984-09-12 to 1985-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Blair Ernest → Blair Coal Company Inc; 1984-09-12 to 1985-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Four B & C Coal Company Inc → No 1; 1985-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coble Robert L → Four B & C Coal Company Inc; 1985-11-27 to current/open; source msha-controller-operator-history