# Relationship history for MSHA mine 3401354

Current hierarchy: **Petroleum Reserve Corp → Carbonex Coal Company → Craig County Mine**

- 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:** Petroleum Reserve Corp → Craig County Mine; 1975-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carbonex Coal Company → Craig County Mine; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Petroleum Reserve Corp → Carbonex Coal Company; 1982-02-01 to current/open; source msha-controller-operator-history