# Relationship history for MSHA mine 1700801

Current hierarchy: **John (Jake) E  Barbour → Jake Barbour Inc → JBI - Crushing / Screening**

- 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:** Jake Barbour Inc → JBI - Crushing / Screening; 2006-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John (Jake) E  Barbour → JBI - Crushing / Screening; 2006-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John (Jake) E  Barbour → Jake Barbour Inc; 2006-06-06 to current/open; source msha-controller-operator-history