# Relationship history for MSHA mine 1800263

Current hierarchy: **Roger L  Brashear; Darlene  Brashear → Brashear Coal Mines → No 1 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

- **operator_operates_mine:** Brashear Coal Mines → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darlene  Brashear et al → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darlene  Brashear et al → Brashear Coal Mines; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger L  Brashear et al → Brashear Coal Mines; 1950-01-01 to current/open; source msha-controller-operator-history