# Relationship history for MSHA mine 4002814

Current hierarchy: **Asbury Charles M → Key Mining Inc → #5**

- 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:** Roger E  West → #5; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coal Acquisition Inc → #5; 1977-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oliver Springs Mining Company Inc → #5; 1982-11-01 to 1988-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Coal Acquisition Inc → Oliver Springs Mining Company Inc; 1982-11-01 to 1988-06-05; source msha-controller-operator-history
- **operator_operates_mine:** West Coal Corp → #5; 1988-06-06 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → West Coal Corp; 1988-06-06 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Asbury Charles M → #5; 1991-06-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Key Mining Inc → #5; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asbury Charles M → Key Mining Inc; 1991-06-24 to current/open; source msha-controller-operator-history