# Relationship history for MSHA mine 4801336

Current hierarchy: **Powder River Coal Co & Pan Eastern Coal Co → North Antelope Coal Company → North Antelope 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:** North Antelope Coal Company → North Antelope Mine; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Powder River Coal Co & Pan Eastern Coal Co → North Antelope Mine; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Powder River Coal Co & Pan Eastern Coal Co → North Antelope Coal Company; 1980-11-01 to current/open; source msha-controller-operator-history