# Relationship history for MSHA mine 4201585

Current hierarchy: **Savage Industries Inc → Ideal Rock Products → Brigham City 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ideal Rock Products → Brigham City Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Savage Industries Inc → Brigham City Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Savage Industries Inc → Ideal Rock Products; 1979-01-01 to current/open; source msha-controller-operator-history