# Relationship history for MSHA mine 4003531

Current hierarchy: **Robert Duane  Zollinger; Sandra L  Barrow; Tracy S  Azzolino; John  Azzo → Dayton Mountain Quarries, LLC → Laurelbrook Quarry2**

- 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

- **controller_controls_mine:** Daryll E  Ellis et al → Laurelbrook Quarry2; 2006-05-17 to 2020-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Majestic Products Inc → Laurelbrook Quarry2; 2020-01-06 to 2026-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Daryll E  Ellis et al → Majestic Products Inc; 2020-01-06 to 2020-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Russell D  Zollinger et al → Majestic Products Inc; 2020-01-06 to 2020-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Russell D  Zollinger → Laurelbrook Quarry2; 2020-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell D  Zollinger → Majestic Products Inc; 2020-01-06 to 2026-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Dayton Mountain Quarries, LLC → Laurelbrook Quarry2; 2026-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sandra L  Barrow et al → Laurelbrook Quarry2; 2026-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra L  Barrow et al → Dayton Mountain Quarries, LLC; 2026-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Duane  Zollinger et al → Dayton Mountain Quarries, LLC; 2026-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Azzolino et al → Dayton Mountain Quarries, LLC; 2026-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy S  Azzolino et al → Dayton Mountain Quarries, LLC; 2026-02-17 to current/open; source msha-controller-operator-history