# Relationship history for MSHA mine 4607387

Current hierarchy: **Imperial-Pacific Investments Inc → Hawks Nest Mining Company → 5-Block Auger 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Imperial-Pacific Investments Inc → 5-Block Auger Mine; 1987-01-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hawks Nest Mining Company → 5-Block Auger Mine; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imperial-Pacific Investments Inc → Hawks Nest Mining Company; 1987-10-01 to current/open; source msha-controller-operator-history