# Relationship history for MSHA mine 1518370

Current hierarchy: **J Mark  Campbell → Premier Elkhorn Coal Company → E3-5B**

- 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:** Rex  Fought → E3-5B; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → E3-5B; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Milford T  Compton → E3-5B; 2001-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sheep Fork Energy Inc → E3-5B; 2001-04-01 to 2001-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Fought → Sheep Fork Energy Inc; 2001-04-01 to 2001-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Star Services Corp. → E3-5B; 2001-10-22 to 2002-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Milford T  Compton → Star Services Corp.; 2001-10-22 to 2002-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → E3-5B; 2002-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 2002-01-18 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → E3-5B; 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 2019-06-15; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → E3-5B; 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 current/open; source msha-controller-operator-history