# Relationship history for MSHA mine 4607417

Current hierarchy: **Stephen  Hairston → Black Knight Energy Inc → Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Morgan Oscar → Mine No 1; 1986-05-14 to 1989-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Morgan Energy Inc → Mine No 1; 1987-12-01 to 1988-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Oscar → Morgan Energy Inc; 1987-12-01 to 1988-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Double A Mining Inc → Mine No 1; 1988-05-19 to 1989-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Ballard L  Dixon → Mine No 1; 1988-05-19 to 1989-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Ballard L  Dixon → Double A Mining Inc; 1988-05-19 to 1989-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Black Knight Energy Inc → Mine No 1; 1989-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Hairston → Mine No 1; 1989-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Hairston → Black Knight Energy Inc; 1989-03-09 to current/open; source msha-controller-operator-history