# Relationship history for MSHA mine 1510475

Current hierarchy: **Poteet J W → Black Joe Coal Company Inc → No 1 Mine**

- 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:** Nolansburg Energy Ltd → No 1 Mine; 1977-06-01 to 1977-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Sergent Ben → No 1 Mine; 1977-06-01 to 1977-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Sergent Ben → Nolansburg Energy Ltd; 1977-06-01 to 1977-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Dowell Mining Company Inc → No 1 Mine; 1977-08-18 to 1984-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Dowell Harold → No 1 Mine; 1977-08-18 to 1984-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Dowell Harold → Dowell Mining Company Inc; 1977-08-18 to 1984-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Saylor Delbert & Darlene Roberts → No 1 Mine; 1982-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dan Del Coals Inc → No 1 Mine; 1984-09-24 to 1985-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Saylor Delbert & Darlene Roberts → Dan Del Coals Inc; 1984-09-24 to 1985-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Lemar Reece → No 1 Mine; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Poteet J W → No 1 Mine; 1985-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shauna-Darease Coal Inc → No 1 Mine; 1985-05-10 to 1986-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Lemar Reece → Shauna-Darease Coal Inc; 1985-05-10 to 1986-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Black Joe Coal Company Inc → No 1 Mine; 1986-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Poteet J W → Black Joe Coal Company Inc; 1986-04-21 to current/open; source msha-controller-operator-history