# Relationship history for MSHA mine 1514409

Current hierarchy: **Carroll Thomas A → Black Earth Coal Company Inc → Pea Ridge**

- 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:** Black Earth Coal Company Inc → Pea Ridge; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Thomas A → Pea Ridge; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Thomas A → Black Earth Coal Company Inc; 1983-11-01 to current/open; source msha-controller-operator-history