# Relationship history for MSHA mine 1517396

Current hierarchy: **Milford  Compton; Herstel  Ratliff → Black Star Mining 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:** TECO Energy Inc → No 1; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → No 1; 1993-04-01 to 1993-09-22; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 1993-04-01 to 1993-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Blackstar Mining Company Inc → No 1; 1993-09-23 to 1994-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Vaughn Ronald G → No 1; 1993-09-23 to 1994-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Vaughn Ronald G → Blackstar Mining Company Inc; 1993-09-23 to 1994-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Black Star Mining Company Inc → No 1; 1994-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herstel  Ratliff et al → No 1; 1994-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herstel  Ratliff et al → Black Star Mining Company Inc; 1994-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milford  Compton et al → Black Star Mining Company Inc; 1994-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → No 1; 2015-09-21 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → Premier Elkhorn Coal Company; 2015-09-21 to 1993-09-22; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → No 1; 2019-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → Premier Elkhorn Coal Company; 2019-06-16 to 1993-09-22; source msha-controller-operator-history