# Relationship history for MSHA mine 4606573

Current hierarchy: **Imperial-Pacific Investments Inc → Winchester Coals Inc → Big Creek Loadout**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Imperial-Pacific Investments Inc → Big Creek Loadout; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Winchester Coals Inc → Big Creek Loadout; 1982-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imperial-Pacific Investments Inc → Winchester Coals Inc; 1982-06-01 to current/open; source msha-controller-operator-history