# Relationship history for MSHA mine 1512177

Current hierarchy: **J Mark  Campbell → Premier Elkhorn Coal Company → Potter Refuse**

- 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:** James W  Potter et al → Potter Refuse; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → Potter Refuse; 1979-12-01 to 1989-01-31; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1979-12-01 to 1989-01-31; source msha-controller-operator-history
- **controller_controls_mine:** David W  Potter et al → Potter Refuse; 1988-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → Potter Refuse; 1989-02-01 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_operator:** David W  Potter et al → Potter Mining Company Inc; 1989-02-01 to 1990-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Potter et al → Potter Mining Company Inc; 1989-02-01 to 1990-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Kentucky Inc → Potter Refuse; 1990-05-01 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sunnyside Mines Inc → Potter Refuse; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunnyside Mines Inc → Sunnyside Kentucky Inc; 1990-05-01 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → Potter Refuse; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Elc Inc → Potter Refuse; 1992-06-01 to 2001-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → Potter Refuse; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Elc Inc; 1992-06-01 to 2001-11-30; source msha-controller-operator-history
- **controller_controls_mine:** American Electric Power Company Inc → Potter Refuse; 2001-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AEP Kentucky Coal, L. L. C. → Potter Refuse; 2001-12-01 to 2005-04-27; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → AEP Kentucky Coal, L. L. C.; 2001-12-01 to 2005-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → Potter Refuse; 2005-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 2005-04-28 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Potter Refuse; 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 → Potter Refuse; 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