# Relationship history for MSHA mine 2902221

Current hierarchy: **Robert R  Ortega → Ortega's Gravel Pit → ORTEGA'S GRAVEL PIT**

- 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

- **operator_operates_mine:** Ortega's Gravel Pit → ORTEGA'S GRAVEL PIT; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert R  Ortega → ORTEGA'S GRAVEL PIT; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Ortega → Ortega's Gravel Pit; 2001-05-01 to current/open; source msha-controller-operator-history