# Relationship history for MSHA mine 2103475

Current hierarchy: **Darrell G  Podvin → Preferred Crushing → Big Red**

- 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:** Preferred Crushing → Big Red; 2005-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrell G  Podvin → Big Red; 2005-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell G  Podvin → Preferred Crushing; 2005-03-31 to current/open; source msha-controller-operator-history