# Relationship history for MSHA mine 3302880

Current hierarchy: **Empryean Corp → Empryean Corp → Brush Creek 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:** Beaver Mining & Coal Company Inc → Brush Creek Mine; 1950-01-01 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Townsand Frank → Brush Creek Mine; 1950-01-01 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Townsand Frank → Beaver Mining & Coal Company Inc; 1950-01-01 to 1981-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Empryean Corp → Brush Creek Mine; 1981-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Empryean Corp → Brush Creek Mine; 1981-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Empryean Corp → Empryean Corp; 1981-05-11 to current/open; source msha-controller-operator-history