# Relationship history for MSHA mine 3102091

Current hierarchy: **Henraux & Erorepe → Balfour Quarry Inc → BALFOUR 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:** Balfour Quarry Inc → BALFOUR QUARRY; 1992-08-01 to 1997-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Walter Svaluto  Ferro → BALFOUR QUARRY; 1992-08-01 to 1997-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Walter Svaluto  Ferro → Balfour Quarry Inc; 1992-08-01 to 1997-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Balfour Quarry Inc → BALFOUR QUARRY; 1997-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henraux & Erorepe → BALFOUR QUARRY; 1997-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henraux & Erorepe → Balfour Quarry Inc; 1997-06-25 to current/open; source msha-controller-operator-history