# Relationship history for MSHA mine 3003521

Current hierarchy: **John  Borer → John Borer → Edelrock Gravel Products**

- 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  Borer → Edelrock Gravel Products; 2001-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John Borer → Edelrock Gravel Products; 2005-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Borer → John Borer; 2005-10-12 to current/open; source msha-controller-operator-history