# Relationship history for MSHA mine 3003423

Current hierarchy: **Jerald  Hulbert → Jerald Hulbert → Readburn Hill Quarry**

- 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:** Jerald Hulbert → Readburn Hill Quarry; 2002-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerald  Hulbert → Readburn Hill Quarry; 2002-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerald  Hulbert → Jerald Hulbert; 2002-07-16 to current/open; source msha-controller-operator-history