# Relationship history for MSHA mine 3609405

Current hierarchy: **Carl H  Behling; Robert C  Dixon → BOCA Coal Inc → PHOENIX**

- 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:** BOCA Coal Inc → PHOENIX; 2006-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Dixon  et al → PHOENIX; 2006-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Dixon  et al → BOCA Coal Inc; 2006-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl H  Behling  et al → BOCA Coal Inc; 2006-04-18 to current/open; source msha-controller-operator-history