# Relationship history for MSHA mine 1515686

Current hierarchy: **Duncan James E → Premier Coal Corp → Mine 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:** Roberts Thomas W Et Al → Mine No 1; 1984-01-11 to 1988-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Lemar Reece → Mine No 1; 1985-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twr Inc → Mine No 1; 1986-07-01 to 1986-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Thomas W Et Al → Mine No 1; 1986-07-01 to 1986-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Thomas W Et Al → Twr Inc; 1986-07-01 to 1986-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Shauna-Darease Coal Inc → Mine No 1; 1986-10-22 to 1987-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Lemar Reece → Shauna-Darease Coal Inc; 1986-10-22 to 1987-06-24; source msha-controller-operator-history
- **operator_operates_mine:** L A R Mining Company Inc → Mine No 1; 1987-06-25 to 1988-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Thomas W Et Al → L A R Mining Company Inc; 1987-06-25 to 1988-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Wallen Glenn A → Mine No 1; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raggs Mining Company Inc → Mine No 1; 1988-11-22 to 1989-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Wallen Glenn A → Raggs Mining Company Inc; 1988-11-22 to 1989-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Premier Coal Corp → Mine No 1; 1989-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duncan James E → Mine No 1; 1989-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duncan James E → Premier Coal Corp; 1989-11-29 to current/open; source msha-controller-operator-history