# Relationship history for MSHA mine 3000068

Current hierarchy: **New Enterprise Stone & Lime Company Inc → Buffalo Crushed Stone Inc. → BARTON ROAD 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:** Lancaster Stone Products Llc → BARTON ROAD QUARRY; 1950-01-01 to 2002-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Sunrock Group Holdings Corp → BARTON ROAD QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunrock Group Holdings Corp → Lancaster Stone Products Llc; 1950-01-01 to 2002-03-05; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → BARTON ROAD QUARRY; 2000-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Crushed Stone Inc. → BARTON ROAD QUARRY; 2002-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Buffalo Crushed Stone Inc.; 2002-03-06 to current/open; source msha-controller-operator-history