# Relationship history for MSHA mine 4300554

Current hierarchy: **Jonathan  Hill; Edward  Vladyka → BRIAR HILL QUARRY, LLC → BIG BOSTON 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:** Briar Hill Quarry, LLC → BIG BOSTON QUARRY; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Hill → BIG BOSTON QUARRY; 2000-12-01 to 2024-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Hill → Briar Hill Quarry, LLC; 2000-12-01 to 2024-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Vladyka et al → BIG BOSTON QUARRY; 2024-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Vladyka et al → Briar Hill Quarry, LLC; 2024-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  Hill et al → Briar Hill Quarry, LLC; 2024-01-18 to current/open; source msha-controller-operator-history