# Relationship history for MSHA mine 1506370

Current hierarchy: **J Mark  Campbell → Apex Energy, Inc. → Apex Tipple No. 3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Potter Mining Company Inc → Apex Tipple No. 3; 1950-01-01 to 1989-07-09; source msha-controller-operator-history
- **controller_controls_mine:** James W  Potter et al → Apex Tipple No. 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1950-01-01 to 1989-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Potter Gordon → Apex Tipple No. 3; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Potter et al → Apex Tipple No. 3; 1988-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → Apex Tipple No. 3; 1989-07-10 to 1989-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Potter et al → Potter Mining Company Inc; 1989-07-10 to 1989-07-19; source msha-controller-operator-history
- **controller_controls_operator:** David W  Potter et al → Potter Mining Company Inc; 1989-07-10 to 1989-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Marathon Coal Corp → Apex Tipple No. 3; 1989-07-20 to 2002-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Potter Gordon → Marathon Coal Corp; 1989-07-20 to 2002-12-10; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Apex Tipple No. 3; 2000-08-11 to 2019-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Apex Energy, Inc. → Apex Tipple No. 3; 2002-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → Apex Energy, Inc.; 2002-12-11 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → Apex Tipple No. 3; 2019-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → Apex Energy, Inc.; 2019-06-16 to current/open; source msha-controller-operator-history