# Relationship history for MSHA mine 1700805

Current hierarchy: **John (Jake) E  Barbour → Jake Barbour Inc → Pioneer Jaw Crusher & Metso Cone Crusher**

- 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

- **controller_controls_mine:** John (Jake) E  Barbour → Pioneer Jaw Crusher & Metso Cone Crusher; 2006-06-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jake Barbour Inc → Pioneer Jaw Crusher & Metso Cone Crusher; 2006-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John (Jake) E  Barbour → Jake Barbour Inc; 2006-09-07 to current/open; source msha-controller-operator-history