# Relationship history for MSHA mine 0502946

Current hierarchy: **Urralburu Ben → Urralburu Mining Company → Murietta**

- 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:** Urralburu Mining Company → Murietta; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Urralburu Ben → Murietta; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Urralburu Ben → Urralburu Mining Company; 1950-01-01 to current/open; source msha-controller-operator-history