# Relationship history for MSHA mine 1515378

Current hierarchy: **Pittston Company → Eastern Coal Corp → Pc-#2**

- 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:** Pittston Company → Pc-#2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roman Coal Company Inc → Pc-#2; 1985-09-01 to 1985-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield Woodrow-Ermel Et Al → Pc-#2; 1985-09-01 to 1985-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Woodrow-Ermel Et Al → Roman Coal Company Inc; 1985-09-01 to 1985-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Coal Corp → Pc-#2; 1985-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Eastern Coal Corp; 1985-12-05 to current/open; source msha-controller-operator-history