# Relationship history for MSHA mine 1516887

Current hierarchy: **Burchett Jeff → Koal Mining Inc → No 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Koal Mining Inc → No 1; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burchett Jeff → No 1; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burchett Jeff → Koal Mining Inc; 1990-05-01 to current/open; source msha-controller-operator-history