# Relationship history for MSHA mine 3000083

Current hierarchy: **CRH PLC → TILCON NEW YORK INC → WEST NYACK 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:** New York Trap Rock Corp → WEST NYACK QUARRY; 1950-01-01 to 1997-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → WEST NYACK QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → New York Trap Rock Corp; 1950-01-01 to 1997-11-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → WEST NYACK QUARRY; 1996-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon New York Inc → WEST NYACK QUARRY; 1997-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon New York Inc; 1997-11-05 to current/open; source msha-controller-operator-history