# Relationship history for MSHA mine 4801406

Current hierarchy: **Internorth Inc → Belco Petroleum Corp → Carbon Basin 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

- **operator_operates_mine:** Belco Petroleum Corp → Carbon Basin Mine; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Internorth Inc → Carbon Basin Mine; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Internorth Inc → Belco Petroleum Corp; 1984-03-01 to current/open; source msha-controller-operator-history