# Relationship history for MSHA mine 4608119

Current hierarchy: **David  Stevenson → Conquest Coal Mining Inc → Mine 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

- **controller_controls_mine:** David  Stevenson → Mine No 3; 1988-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Conquest Coal Mining Inc → Mine No 3; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Stevenson → Conquest Coal Mining Inc; 1992-01-01 to current/open; source msha-controller-operator-history