# Relationship history for MSHA mine 1518784

Current hierarchy: **J Mark  Campbell → Premier Elkhorn Coal Company → Job #45**

- 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:** Talmage D  Meade → Job #45; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → Job #45; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → Job #45; 2004-08-03 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 2004-08-03 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Meade & Shepherd Coal Company Inc → Job #45; 2005-04-01 to 2005-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Talmage D  Meade → Meade & Shepherd Coal Company Inc; 2005-04-01 to 2005-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → Job #45; 2005-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 2005-11-07 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Job #45; 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 2005-03-31; 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 → Job #45; 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 2005-03-31; 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