# Relationship history for MSHA mine 4606203

Current hierarchy: **Lackey David H → Lackey Coals Inc → Mine No 3b**

- 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:** Lackey Coals Inc → Mine No 3b; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lackey David H → Mine No 3b; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lackey David H → Lackey Coals Inc; 1980-08-01 to current/open; source msha-controller-operator-history