# Relationship history for MSHA mine 1500449

Current hierarchy: **Cooley Nancy → Hamilton Coal Company Inc → No 9 Mine Mi 463 6**

- 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:** Hamilton Coal Company Inc → No 9 Mine Mi 463 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cooley Nancy → No 9 Mine Mi 463 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cooley Nancy → Hamilton Coal Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history