# Relationship history for MSHA mine 2002450

Current hierarchy: **Hebert Al J → Hebert Excavating → State Owned 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:** Hebert Excavating → State Owned Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hebert Al J → State Owned Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hebert Al J → Hebert Excavating; 1979-01-01 to current/open; source msha-controller-operator-history