# Relationship history for MSHA mine 1516203

Current hierarchy: **Kern  Brashear → Kern Coal Company Inc → Mine #1**

- 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:** Kern Coal Company Inc → Mine #1; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kern  Brashear → Mine #1; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kern  Brashear → Kern Coal Company Inc; 1987-10-01 to current/open; source msha-controller-operator-history