# Relationship history for MSHA mine 2103499

Current hierarchy: **Kevin  Bursch → Bursch Brothers Inc → Bursch Brothers Inc (Chieftain 1400)**

- 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

- **controller_controls_mine:** Kevin  Bursch et al → Bursch Brothers Inc (Chieftain 1400); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bursch Brothers Inc → Bursch Brothers Inc (Chieftain 1400); 2005-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Bursch et al → Bursch Brothers Inc; 2005-05-25 to current/open; source msha-controller-operator-history